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Finding the Fourth Proportional to 158,690.88, 218,959.20 and 91,584

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Solution

The fourth proportional to 158,690.88, 218,959.20 and 91,584 is: 126,366.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    158,690.88 : 218,959.20 = 91,584 : x
  2. Step 2: Convert to fraction form
    158,690.88/218,959.20 = 91,584/x
  3. Step 3: Cross multiply
    158,690.88x = 218,959.20 × 91,584
  4. Step 4: Simplify right side
    158,690.88x = 20,053,159,372.80
  5. Step 5: Solve for x
    x = 20,053,159,372.80/158,690.88
  6. Step 6: Final answer
    x = 126,366.17

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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.