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Finding the Fourth Proportional to 57.72, 79.65 and 31.49

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Solution

The fourth proportional to 57.72, 79.65 and 31.49 is: 43.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.72 : 79.65 = 31.49 : x
  2. Step 2: Convert to fraction form
    57.72/79.65 = 31.49/x
  3. Step 3: Cross multiply
    57.72x = 79.65 × 31.49
  4. Step 4: Simplify right side
    57.72x = 2,508.18
  5. Step 5: Solve for x
    x = 2,508.18/57.72
  6. Step 6: Final answer
    x = 43.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.