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Finding the Fourth Proportional to 32.12, 47.78 and 31.36

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Solution

The fourth proportional to 32.12, 47.78 and 31.36 is: 46.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    32.12 : 47.78 = 31.36 : x
  2. Step 2: Convert to fraction form
    32.12/47.78 = 31.36/x
  3. Step 3: Cross multiply
    32.12x = 47.78 × 31.36
  4. Step 4: Simplify right side
    32.12x = 1,498.38
  5. Step 5: Solve for x
    x = 1,498.38/32.12
  6. Step 6: Final answer
    x = 46.65

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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.