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Finding the Fourth Proportional to 136,151.12, 203,788.62 and 72,812.78

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Solution

The fourth proportional to 136,151.12, 203,788.62 and 72,812.78 is: 108,984.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,151.12 : 203,788.62 = 72,812.78 : x
  2. Step 2: Convert to fraction form
    136,151.12/203,788.62 = 72,812.78/x
  3. Step 3: Cross multiply
    136,151.12x = 203,788.62 × 72,812.78
  4. Step 4: Simplify right side
    136,151.12x = 14,838,415,954.56
  5. Step 5: Solve for x
    x = 14,838,415,954.56/136,151.12
  6. Step 6: Final answer
    x = 108,984.90

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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.