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Finding the Fourth Proportional to 31.47, 47.22 and 15.45

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Solution

The fourth proportional to 31.47, 47.22 and 15.45 is: 23.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.47 : 47.22 = 15.45 : x
  2. Step 2: Convert to fraction form
    31.47/47.22 = 15.45/x
  3. Step 3: Cross multiply
    31.47x = 47.22 × 15.45
  4. Step 4: Simplify right side
    31.47x = 729.55
  5. Step 5: Solve for x
    x = 729.55/31.47
  6. Step 6: Final answer
    x = 23.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.