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Finding the Fourth Proportional to 39.60, 59.42 and 21.56

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Solution

The fourth proportional to 39.60, 59.42 and 21.56 is: 32.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.60 : 59.42 = 21.56 : x
  2. Step 2: Convert to fraction form
    39.60/59.42 = 21.56/x
  3. Step 3: Cross multiply
    39.60x = 59.42 × 21.56
  4. Step 4: Simplify right side
    39.60x = 1,281.30
  5. Step 5: Solve for x
    x = 1,281.30/39.60
  6. Step 6: Final answer
    x = 32.36

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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.