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Finding the Fourth Proportional to 32.11, 47.76 and 31.81

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Solution

The fourth proportional to 32.11, 47.76 and 31.81 is: 47.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    32.11 : 47.76 = 31.81 : x
  2. Step 2: Convert to fraction form
    32.11/47.76 = 31.81/x
  3. Step 3: Cross multiply
    32.11x = 47.76 × 31.81
  4. Step 4: Simplify right side
    32.11x = 1,519.10
  5. Step 5: Solve for x
    x = 1,519.10/32.11
  6. Step 6: Final answer
    x = 47.30

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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.