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Finding the Fourth Proportional to 43.71, 65.63 and 20.89

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Solution

The fourth proportional to 43.71, 65.63 and 20.89 is: 31.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.71 : 65.63 = 20.89 : x
  2. Step 2: Convert to fraction form
    43.71/65.63 = 20.89/x
  3. Step 3: Cross multiply
    43.71x = 65.63 × 20.89
  4. Step 4: Simplify right side
    43.71x = 1,371.01
  5. Step 5: Solve for x
    x = 1,371.01/43.71
  6. Step 6: Final answer
    x = 31.37

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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.