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Finding the Fourth Proportional to 8.47, 12.70 and 3.72

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Solution

The fourth proportional to 8.47, 12.70 and 3.72 is: 5.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.47 : 12.70 = 3.72 : x
  2. Step 2: Convert to fraction form
    8.47/12.70 = 3.72/x
  3. Step 3: Cross multiply
    8.47x = 12.70 × 3.72
  4. Step 4: Simplify right side
    8.47x = 47.24
  5. Step 5: Solve for x
    x = 47.24/8.47
  6. Step 6: Final answer
    x = 5.58

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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.