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Finding the Fourth Proportional to 40.56, 60.86 and 21.30

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Solution

The fourth proportional to 40.56, 60.86 and 21.30 is: 31.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    40.56 : 60.86 = 21.30 : x
  2. Step 2: Convert to fraction form
    40.56/60.86 = 21.30/x
  3. Step 3: Cross multiply
    40.56x = 60.86 × 21.30
  4. Step 4: Simplify right side
    40.56x = 1,296.47
  5. Step 5: Solve for x
    x = 1,296.47/40.56
  6. Step 6: Final answer
    x = 31.96

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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.