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Finding the Fourth Proportional to 129,369.60, 178,522.56 and 72,777.60

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Solution

The fourth proportional to 129,369.60, 178,522.56 and 72,777.60 is: 100,428.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,369.60 : 178,522.56 = 72,777.60 : x
  2. Step 2: Convert to fraction form
    129,369.60/178,522.56 = 72,777.60/x
  3. Step 3: Cross multiply
    129,369.60x = 178,522.56 × 72,777.60
  4. Step 4: Simplify right side
    129,369.60x = 12,992,443,462.66
  5. Step 5: Solve for x
    x = 12,992,443,462.66/129,369.60
  6. Step 6: Final answer
    x = 100,428.88

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1.5x scale

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.