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Finding the Fourth Proportional to 521,605.40, 782,408.10 and 486,613.40

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Solution

The fourth proportional to 521,605.40, 782,408.10 and 486,613.40 is: 729,920.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    521,605.40 : 782,408.10 = 486,613.40 : x
  2. Step 2: Convert to fraction form
    521,605.40/782,408.10 = 486,613.40/x
  3. Step 3: Cross multiply
    521,605.40x = 782,408.10 × 486,613.40
  4. Step 4: Simplify right side
    521,605.40x = 380,730,265,728.54
  5. Step 5: Solve for x
    x = 380,730,265,728.54/521,605.40
  6. Step 6: Final answer
    x = 729,920.10

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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.