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Finding the Fourth Proportional to 12.61, 17.42 and 10.20

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Solution

The fourth proportional to 12.61, 17.42 and 10.20 is: 14.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    12.61 : 17.42 = 10.20 : x
  2. Step 2: Convert to fraction form
    12.61/17.42 = 10.20/x
  3. Step 3: Cross multiply
    12.61x = 17.42 × 10.20
  4. Step 4: Simplify right side
    12.61x = 177.55
  5. Step 5: Solve for x
    x = 177.55/12.61
  6. Step 6: Final answer
    x = 14.09

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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.