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Finding the Fourth Proportional to 9.04, 12.47 and 8.61

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Solution

The fourth proportional to 9.04, 12.47 and 8.61 is: 11.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.04 : 12.47 = 8.61 : x
  2. Step 2: Convert to fraction form
    9.04/12.47 = 8.61/x
  3. Step 3: Cross multiply
    9.04x = 12.47 × 8.61
  4. Step 4: Simplify right side
    9.04x = 107.37
  5. Step 5: Solve for x
    x = 107.37/9.04
  6. Step 6: Final answer
    x = 11.88

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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.