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Finding the Fourth Proportional to 9.85, 13.56 and 7.42

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Solution

The fourth proportional to 9.85, 13.56 and 7.42 is: 10.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.85 : 13.56 = 7.42 : x
  2. Step 2: Convert to fraction form
    9.85/13.56 = 7.42/x
  3. Step 3: Cross multiply
    9.85x = 13.56 × 7.42
  4. Step 4: Simplify right side
    9.85x = 100.62
  5. Step 5: Solve for x
    x = 100.62/9.85
  6. Step 6: Final answer
    x = 10.21

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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.