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Finding the Fourth Proportional to 8.47, 12.71 and 3.13

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Solution

The fourth proportional to 8.47, 12.71 and 3.13 is: 4.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.47 : 12.71 = 3.13 : x
  2. Step 2: Convert to fraction form
    8.47/12.71 = 3.13/x
  3. Step 3: Cross multiply
    8.47x = 12.71 × 3.13
  4. Step 4: Simplify right side
    8.47x = 39.70
  5. Step 5: Solve for x
    x = 39.70/8.47
  6. Step 6: Final answer
    x = 4.69

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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.