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Finding the Fourth Proportional to 9.55, 13.17 and 9.35

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Solution

The fourth proportional to 9.55, 13.17 and 9.35 is: 12.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.55 : 13.17 = 9.35 : x
  2. Step 2: Convert to fraction form
    9.55/13.17 = 9.35/x
  3. Step 3: Cross multiply
    9.55x = 13.17 × 9.35
  4. Step 4: Simplify right side
    9.55x = 123.14
  5. Step 5: Solve for x
    x = 123.14/9.55
  6. Step 6: Final answer
    x = 12.89

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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.