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Finding the Fourth Proportional to 159.10, 219.59 and 100.87

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Solution

The fourth proportional to 159.10, 219.59 and 100.87 is: 139.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.10 : 219.59 = 100.87 : x
  2. Step 2: Convert to fraction form
    159.10/219.59 = 100.87/x
  3. Step 3: Cross multiply
    159.10x = 219.59 × 100.87
  4. Step 4: Simplify right side
    159.10x = 22,150.04
  5. Step 5: Solve for x
    x = 22,150.04/159.10
  6. Step 6: Final answer
    x = 139.22

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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.