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Finding the Fourth Proportional to 43.72, 65.55 and 31.53

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Solution

The fourth proportional to 43.72, 65.55 and 31.53 is: 47.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.72 : 65.55 = 31.53 : x
  2. Step 2: Convert to fraction form
    43.72/65.55 = 31.53/x
  3. Step 3: Cross multiply
    43.72x = 65.55 × 31.53
  4. Step 4: Simplify right side
    43.72x = 2,067.16
  5. Step 5: Solve for x
    x = 2,067.16/43.72
  6. Step 6: Final answer
    x = 47.28

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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.