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Finding the Fourth Proportional to 158,732.79, 218,988.90 and 90,713.28

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Solution

The fourth proportional to 158,732.79, 218,988.90 and 90,713.28 is: 125,148.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,732.79 : 218,988.90 = 90,713.28 : x
  2. Step 2: Convert to fraction form
    158,732.79/218,988.90 = 90,713.28/x
  3. Step 3: Cross multiply
    158,732.79x = 218,988.90 × 90,713.28
  4. Step 4: Simplify right side
    158,732.79x = 19,865,201,402.59
  5. Step 5: Solve for x
    x = 19,865,201,402.59/158,732.79
  6. Step 6: Final answer
    x = 125,148.69

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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.