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Finding the Fourth Proportional to 32.72, 48.70 and 31.88

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Solution

The fourth proportional to 32.72, 48.70 and 31.88 is: 47.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    32.72 : 48.70 = 31.88 : x
  2. Step 2: Convert to fraction form
    32.72/48.70 = 31.88/x
  3. Step 3: Cross multiply
    32.72x = 48.70 × 31.88
  4. Step 4: Simplify right side
    32.72x = 1,552.56
  5. Step 5: Solve for x
    x = 1,552.56/32.72
  6. Step 6: Final answer
    x = 47.45

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.