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Finding the Fourth Proportional to 158.71, 218.86 and 109.61

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Solution

The fourth proportional to 158.71, 218.86 and 109.61 is: 151.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.71 : 218.86 = 109.61 : x
  2. Step 2: Convert to fraction form
    158.71/218.86 = 109.61/x
  3. Step 3: Cross multiply
    158.71x = 218.86 × 109.61
  4. Step 4: Simplify right side
    158.71x = 23,989.24
  5. Step 5: Solve for x
    x = 23,989.24/158.71
  6. Step 6: Final answer
    x = 151.15

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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.