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Finding the Fourth Proportional to 457,480.80, 686,221.20 and 339,382.80

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Solution

The fourth proportional to 457,480.80, 686,221.20 and 339,382.80 is: 509,074.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    457,480.80 : 686,221.20 = 339,382.80 : x
  2. Step 2: Convert to fraction form
    457,480.80/686,221.20 = 339,382.80/x
  3. Step 3: Cross multiply
    457,480.80x = 686,221.20 × 339,382.80
  4. Step 4: Simplify right side
    457,480.80x = 232,891,672,275.36
  5. Step 5: Solve for x
    x = 232,891,672,275.36/457,480.80
  6. Step 6: Final answer
    x = 509,074.20

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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.