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Finding the Fourth Proportional to 158.61, 218.89 and 93.11

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Solution

The fourth proportional to 158.61, 218.89 and 93.11 is: 128.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.61 : 218.89 = 93.11 : x
  2. Step 2: Convert to fraction form
    158.61/218.89 = 93.11/x
  3. Step 3: Cross multiply
    158.61x = 218.89 × 93.11
  4. Step 4: Simplify right side
    158.61x = 20,380.38
  5. Step 5: Solve for x
    x = 20,380.38/158.61
  6. Step 6: Final answer
    x = 128.49

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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.