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Finding the Fourth Proportional to 12.79, 17.62 and 9.87

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Solution

The fourth proportional to 12.79, 17.62 and 9.87 is: 13.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.79 : 17.62 = 9.87 : x
  2. Step 2: Convert to fraction form
    12.79/17.62 = 9.87/x
  3. Step 3: Cross multiply
    12.79x = 17.62 × 9.87
  4. Step 4: Simplify right side
    12.79x = 173.91
  5. Step 5: Solve for x
    x = 173.91/12.79
  6. Step 6: Final answer
    x = 13.60

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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.