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Finding the Fourth Proportional to 129,409.60, 178,682.55 and 127,342.90

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Solution

The fourth proportional to 129,409.60, 178,682.55 and 127,342.90 is: 175,828.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,409.60 : 178,682.55 = 127,342.90 : x
  2. Step 2: Convert to fraction form
    129,409.60/178,682.55 = 127,342.90/x
  3. Step 3: Cross multiply
    129,409.60x = 178,682.55 × 127,342.90
  4. Step 4: Simplify right side
    129,409.60x = 22,753,954,096.40
  5. Step 5: Solve for x
    x = 22,753,954,096.40/129,409.60
  6. Step 6: Final answer
    x = 175,828.95

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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.