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Finding the Fourth Proportional to 159.81, 220.53 and 100.86

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Solution

The fourth proportional to 159.81, 220.53 and 100.86 is: 139.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    159.81 : 220.53 = 100.86 : x
  2. Step 2: Convert to fraction form
    159.81/220.53 = 100.86/x
  3. Step 3: Cross multiply
    159.81x = 220.53 × 100.86
  4. Step 4: Simplify right side
    159.81x = 22,242.66
  5. Step 5: Solve for x
    x = 22,242.66/159.81
  6. Step 6: Final answer
    x = 139.18

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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.