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Finding the Fourth Proportional to 858,606.90, 1,287,910.35 and 485,358.90

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Solution

The fourth proportional to 858,606.90, 1,287,910.35 and 485,358.90 is: 728,038.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,606.90 : 1,287,910.35 = 485,358.90 : x
  2. Step 2: Convert to fraction form
    858,606.90/1,287,910.35 = 485,358.90/x
  3. Step 3: Cross multiply
    858,606.90x = 1,287,910.35 × 485,358.90
  4. Step 4: Simplify right side
    858,606.90x = 625,098,750,774.62
  5. Step 5: Solve for x
    x = 625,098,750,774.62/858,606.90
  6. Step 6: Final answer
    x = 728,038.35

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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 (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.