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Finding the Fourth Proportional to 71.31, 106.90 and 25.63

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Solution

The fourth proportional to 71.31, 106.90 and 25.63 is: 38.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    71.31 : 106.90 = 25.63 : x
  2. Step 2: Convert to fraction form
    71.31/106.90 = 25.63/x
  3. Step 3: Cross multiply
    71.31x = 106.90 × 25.63
  4. Step 4: Simplify right side
    71.31x = 2,739.76
  5. Step 5: Solve for x
    x = 2,739.76/71.31
  6. Step 6: Final answer
    x = 38.42

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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.