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Finding the Fourth Proportional to 318,296.72, 477,445.19 and 81,639.39

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Solution

The fourth proportional to 318,296.72, 477,445.19 and 81,639.39 is: 122,459.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,296.72 : 477,445.19 = 81,639.39 : x
  2. Step 2: Convert to fraction form
    318,296.72/477,445.19 = 81,639.39/x
  3. Step 3: Cross multiply
    318,296.72x = 477,445.19 × 81,639.39
  4. Step 4: Simplify right side
    318,296.72x = 38,978,335,452.26
  5. Step 5: Solve for x
    x = 38,978,335,452.26/318,296.72
  6. Step 6: Final answer
    x = 122,459.12

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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.