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Finding the Fourth Proportional to 663,636.80, 995,455.20 and 427,246.40

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Solution

The fourth proportional to 663,636.80, 995,455.20 and 427,246.40 is: 640,869.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    663,636.80 : 995,455.20 = 427,246.40 : x
  2. Step 2: Convert to fraction form
    663,636.80/995,455.20 = 427,246.40/x
  3. Step 3: Cross multiply
    663,636.80x = 995,455.20 × 427,246.40
  4. Step 4: Simplify right side
    663,636.80x = 425,304,650,561.28
  5. Step 5: Solve for x
    x = 425,304,650,561.28/663,636.80
  6. Step 6: Final answer
    x = 640,869.60

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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.