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Finding the Fourth Proportional to 11.29, 15.58 and 9.47

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Solution

The fourth proportional to 11.29, 15.58 and 9.47 is: 13.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.29 : 15.58 = 9.47 : x
  2. Step 2: Convert to fraction form
    11.29/15.58 = 9.47/x
  3. Step 3: Cross multiply
    11.29x = 15.58 × 9.47
  4. Step 4: Simplify right side
    11.29x = 147.46
  5. Step 5: Solve for x
    x = 147.46/11.29
  6. Step 6: Final answer
    x = 13.06

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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.