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Finding the Fourth Proportional to 129,336.78, 178,483.95 and 72,748.74

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Solution

The fourth proportional to 129,336.78, 178,483.95 and 72,748.74 is: 100,392.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,336.78 : 178,483.95 = 72,748.74 : x
  2. Step 2: Convert to fraction form
    129,336.78/178,483.95 = 72,748.74/x
  3. Step 3: Cross multiply
    129,336.78x = 178,483.95 × 72,748.74
  4. Step 4: Simplify right side
    129,336.78x = 12,984,482,472.72
  5. Step 5: Solve for x
    x = 12,984,482,472.72/129,336.78
  6. Step 6: Final answer
    x = 100,392.81

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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.