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Finding the Fourth Proportional to 158,640.92, 218,935.61 and 90,667.95

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Solution

The fourth proportional to 158,640.92, 218,935.61 and 90,667.95 is: 125,128.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,640.92 : 218,935.61 = 90,667.95 : x
  2. Step 2: Convert to fraction form
    158,640.92/218,935.61 = 90,667.95/x
  3. Step 3: Cross multiply
    158,640.92x = 218,935.61 × 90,667.95
  4. Step 4: Simplify right side
    158,640.92x = 19,850,442,006.36
  5. Step 5: Solve for x
    x = 19,850,442,006.36/158,640.92
  6. Step 6: Final answer
    x = 125,128.13

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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.