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Finding the Fourth Proportional to 318,885.71, 478,387.44 and 131,911.79

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Solution

The fourth proportional to 318,885.71, 478,387.44 and 131,911.79 is: 197,892.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,885.71 : 478,387.44 = 131,911.79 : x
  2. Step 2: Convert to fraction form
    318,885.71/478,387.44 = 131,911.79/x
  3. Step 3: Cross multiply
    318,885.71x = 478,387.44 × 131,911.79
  4. Step 4: Simplify right side
    318,885.71x = 63,104,941,131.98
  5. Step 5: Solve for x
    x = 63,104,941,131.98/318,885.71
  6. Step 6: Final answer
    x = 197,892.04

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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.