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Finding the Fourth Proportional to 10.39, 15.50 and 9.38

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Solution

The fourth proportional to 10.39, 15.50 and 9.38 is: 13.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.39 : 15.50 = 9.38 : x
  2. Step 2: Convert to fraction form
    10.39/15.50 = 9.38/x
  3. Step 3: Cross multiply
    10.39x = 15.50 × 9.38
  4. Step 4: Simplify right side
    10.39x = 145.39
  5. Step 5: Solve for x
    x = 145.39/10.39
  6. Step 6: Final answer
    x = 13.99

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.