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Finding the Fourth Proportional to 129,132, 178,211.88 and 78,840.72

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Solution

The fourth proportional to 129,132, 178,211.88 and 78,840.72 is: 108,806.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,132 : 178,211.88 = 78,840.72 : x
  2. Step 2: Convert to fraction form
    129,132/178,211.88 = 78,840.72/x
  3. Step 3: Cross multiply
    129,132x = 178,211.88 × 78,840.72
  4. Step 4: Simplify right side
    129,132x = 14,050,352,931.75
  5. Step 5: Solve for x
    x = 14,050,352,931.75/129,132
  6. Step 6: Final answer
    x = 108,806.13

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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.