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Finding the Fourth Proportional to 129,696.90, 178,978.08 and 72,337.95

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Solution

The fourth proportional to 129,696.90, 178,978.08 and 72,337.95 is: 99,824.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,696.90 : 178,978.08 = 72,337.95 : x
  2. Step 2: Convert to fraction form
    129,696.90/178,978.08 = 72,337.95/x
  3. Step 3: Cross multiply
    129,696.90x = 178,978.08 × 72,337.95
  4. Step 4: Simplify right side
    129,696.90x = 12,946,907,402.14
  5. Step 5: Solve for x
    x = 12,946,907,402.14/129,696.90
  6. Step 6: Final answer
    x = 99,824.34

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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.