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Finding the Fourth Proportional to 89.18, 133.80 and 31.42

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Solution

The fourth proportional to 89.18, 133.80 and 31.42 is: 47.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.18 : 133.80 = 31.42 : x
  2. Step 2: Convert to fraction form
    89.18/133.80 = 31.42/x
  3. Step 3: Cross multiply
    89.18x = 133.80 × 31.42
  4. Step 4: Simplify right side
    89.18x = 4,204.22
  5. Step 5: Solve for x
    x = 4,204.22/89.18
  6. Step 6: Final answer
    x = 47.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.