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Finding the Fourth Proportional to 11.47, 15.78 and 9.75

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Solution

The fourth proportional to 11.47, 15.78 and 9.75 is: 13.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.47 : 15.78 = 9.75 : x
  2. Step 2: Convert to fraction form
    11.47/15.78 = 9.75/x
  3. Step 3: Cross multiply
    11.47x = 15.78 × 9.75
  4. Step 4: Simplify right side
    11.47x = 153.86
  5. Step 5: Solve for x
    x = 153.86/11.47
  6. Step 6: Final answer
    x = 13.41

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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.