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Finding the Fourth Proportional to 129,397.50, 178,571.28 and 72,808.88

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Solution

The fourth proportional to 129,397.50, 178,571.28 and 72,808.88 is: 100,477.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,397.50 : 178,571.28 = 72,808.88 : x
  2. Step 2: Convert to fraction form
    129,397.50/178,571.28 = 72,808.88/x
  3. Step 3: Cross multiply
    129,397.50x = 178,571.28 × 72,808.88
  4. Step 4: Simplify right side
    129,397.50x = 13,001,574,277.14
  5. Step 5: Solve for x
    x = 13,001,574,277.14/129,397.50
  6. Step 6: Final answer
    x = 100,477.79

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.