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Finding the Fourth Proportional to 456,811.80, 685,217.70 and 220,178.40

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Solution

The fourth proportional to 456,811.80, 685,217.70 and 220,178.40 is: 330,267.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    456,811.80 : 685,217.70 = 220,178.40 : x
  2. Step 2: Convert to fraction form
    456,811.80/685,217.70 = 220,178.40/x
  3. Step 3: Cross multiply
    456,811.80x = 685,217.70 × 220,178.40
  4. Step 4: Simplify right side
    456,811.80x = 150,870,136,837.68
  5. Step 5: Solve for x
    x = 150,870,136,837.68/456,811.80
  6. Step 6: Final answer
    x = 330,267.60

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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.