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Finding the Fourth Proportional to 318,044.79, 477,066.78 and 81,387.54

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Solution

The fourth proportional to 318,044.79, 477,066.78 and 81,387.54 is: 122,081.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,044.79 : 477,066.78 = 81,387.54 : x
  2. Step 2: Convert to fraction form
    318,044.79/477,066.78 = 81,387.54/x
  3. Step 3: Cross multiply
    318,044.79x = 477,066.78 × 81,387.54
  4. Step 4: Simplify right side
    318,044.79x = 38,827,291,639.92
  5. Step 5: Solve for x
    x = 38,827,291,639.92/318,044.79
  6. Step 6: Final answer
    x = 122,081.21

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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.