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Finding the Fourth Proportional to 12.62, 17.40 and 7.76

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Solution

The fourth proportional to 12.62, 17.40 and 7.76 is: 10.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.62 : 17.40 = 7.76 : x
  2. Step 2: Convert to fraction form
    12.62/17.40 = 7.76/x
  3. Step 3: Cross multiply
    12.62x = 17.40 × 7.76
  4. Step 4: Simplify right side
    12.62x = 134.94
  5. Step 5: Solve for x
    x = 134.94/12.62
  6. Step 6: Final answer
    x = 10.70

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.