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Finding the Fourth Proportional to 685,087.20, 961,221.60 and 685,087.20

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Solution

The fourth proportional to 685,087.20, 961,221.60 and 685,087.20 is: 961,221.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,087.20 : 961,221.60 = 685,087.20 : x
  2. Step 2: Convert to fraction form
    685,087.20/961,221.60 = 685,087.20/x
  3. Step 3: Cross multiply
    685,087.20x = 961,221.60 × 685,087.20
  4. Step 4: Simplify right side
    685,087.20x = 658,520,614,523.52
  5. Step 5: Solve for x
    x = 658,520,614,523.52/685,087.20
  6. Step 6: Final answer
    x = 961,221.60

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.