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Finding the Fourth Proportional to 128,652.55, 177,546.17 and 71,291.71

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Solution

The fourth proportional to 128,652.55, 177,546.17 and 71,291.71 is: 98,385.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,652.55 : 177,546.17 = 71,291.71 : x
  2. Step 2: Convert to fraction form
    128,652.55/177,546.17 = 71,291.71/x
  3. Step 3: Cross multiply
    128,652.55x = 177,546.17 × 71,291.71
  4. Step 4: Simplify right side
    128,652.55x = 12,657,569,797.61
  5. Step 5: Solve for x
    x = 12,657,569,797.61/128,652.55
  6. Step 6: Final answer
    x = 98,385.69

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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.