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Finding the Fourth Proportional to 8.66, 11.95 and 5.42

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Solution

The fourth proportional to 8.66, 11.95 and 5.42 is: 7.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    8.66 : 11.95 = 5.42 : x
  2. Step 2: Convert to fraction form
    8.66/11.95 = 5.42/x
  3. Step 3: Cross multiply
    8.66x = 11.95 × 5.42
  4. Step 4: Simplify right side
    8.66x = 64.74
  5. Step 5: Solve for x
    x = 64.74/8.66
  6. Step 6: Final answer
    x = 7.48

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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.