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Finding the Fourth Proportional to 89.71, 123.82 and 52.39

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Solution

The fourth proportional to 89.71, 123.82 and 52.39 is: 72.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    89.71 : 123.82 = 52.39 : x
  2. Step 2: Convert to fraction form
    89.71/123.82 = 52.39/x
  3. Step 3: Cross multiply
    89.71x = 123.82 × 52.39
  4. Step 4: Simplify right side
    89.71x = 6,486.93
  5. Step 5: Solve for x
    x = 6,486.93/89.71
  6. Step 6: Final answer
    x = 72.31

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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.