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Finding the Fourth Proportional to 42.31, 63.60 and 26.38

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Solution

The fourth proportional to 42.31, 63.60 and 26.38 is: 39.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    42.31 : 63.60 = 26.38 : x
  2. Step 2: Convert to fraction form
    42.31/63.60 = 26.38/x
  3. Step 3: Cross multiply
    42.31x = 63.60 × 26.38
  4. Step 4: Simplify right side
    42.31x = 1,677.77
  5. Step 5: Solve for x
    x = 1,677.77/42.31
  6. Step 6: Final answer
    x = 39.65

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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.