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Finding the Fourth Proportional to 38.96, 53.72 and 31.66

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Solution

The fourth proportional to 38.96, 53.72 and 31.66 is: 43.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    38.96 : 53.72 = 31.66 : x
  2. Step 2: Convert to fraction form
    38.96/53.72 = 31.66/x
  3. Step 3: Cross multiply
    38.96x = 53.72 × 31.66
  4. Step 4: Simplify right side
    38.96x = 1,700.78
  5. Step 5: Solve for x
    x = 1,700.78/38.96
  6. Step 6: Final answer
    x = 43.65

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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.