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Finding the Fourth Proportional to 31.45, 47.18 and 11.15

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Solution

The fourth proportional to 31.45, 47.18 and 11.15 is: 16.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    31.45 : 47.18 = 11.15 : x
  2. Step 2: Convert to fraction form
    31.45/47.18 = 11.15/x
  3. Step 3: Cross multiply
    31.45x = 47.18 × 11.15
  4. Step 4: Simplify right side
    31.45x = 526.17
  5. Step 5: Solve for x
    x = 526.17/31.45
  6. Step 6: Final answer
    x = 16.73

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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.