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Finding the Fourth Proportional to 159.90, 220.61 and 100.87

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Solution

The fourth proportional to 159.90, 220.61 and 100.87 is: 139.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.90 : 220.61 = 100.87 : x
  2. Step 2: Convert to fraction form
    159.90/220.61 = 100.87/x
  3. Step 3: Cross multiply
    159.90x = 220.61 × 100.87
  4. Step 4: Simplify right side
    159.90x = 22,252.98
  5. Step 5: Solve for x
    x = 22,252.98/159.90
  6. Step 6: Final answer
    x = 139.17

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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.