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Finding the Fourth Proportional to 664,547.20, 996,820.80 and 399,126.40

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Solution

The fourth proportional to 664,547.20, 996,820.80 and 399,126.40 is: 598,689.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,547.20 : 996,820.80 = 399,126.40 : x
  2. Step 2: Convert to fraction form
    664,547.20/996,820.80 = 399,126.40/x
  3. Step 3: Cross multiply
    664,547.20x = 996,820.80 × 399,126.40
  4. Step 4: Simplify right side
    664,547.20x = 397,857,497,349.12
  5. Step 5: Solve for x
    x = 397,857,497,349.12/664,547.20
  6. Step 6: Final answer
    x = 598,689.60

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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.