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Finding the Fourth Proportional to 128,042.17, 176,719.76 and 74,372.11

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Solution

The fourth proportional to 128,042.17, 176,719.76 and 74,372.11 is: 102,646.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,042.17 : 176,719.76 = 74,372.11 : x
  2. Step 2: Convert to fraction form
    128,042.17/176,719.76 = 74,372.11/x
  3. Step 3: Cross multiply
    128,042.17x = 176,719.76 × 74,372.11
  4. Step 4: Simplify right side
    128,042.17x = 13,143,020,895.13
  5. Step 5: Solve for x
    x = 13,143,020,895.13/128,042.17
  6. Step 6: Final answer
    x = 102,646.04

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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.