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Finding the Fourth Proportional to 68,711.20, 103,066.80 and 53,159.20

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Solution

The fourth proportional to 68,711.20, 103,066.80 and 53,159.20 is: 79,738.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,711.20 : 103,066.80 = 53,159.20 : x
  2. Step 2: Convert to fraction form
    68,711.20/103,066.80 = 53,159.20/x
  3. Step 3: Cross multiply
    68,711.20x = 103,066.80 × 53,159.20
  4. Step 4: Simplify right side
    68,711.20x = 5,478,948,634.56
  5. Step 5: Solve for x
    x = 5,478,948,634.56/68,711.20
  6. Step 6: Final answer
    x = 79,738.80

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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.