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Finding the Fourth Proportional to 11.39, 15.71 and 9.35

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Solution

The fourth proportional to 11.39, 15.71 and 9.35 is: 12.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    11.39 : 15.71 = 9.35 : x
  2. Step 2: Convert to fraction form
    11.39/15.71 = 9.35/x
  3. Step 3: Cross multiply
    11.39x = 15.71 × 9.35
  4. Step 4: Simplify right side
    11.39x = 146.76
  5. Step 5: Solve for x
    x = 146.76/11.39
  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.