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Finding the Fourth Proportional to 10.28, 15.35 and 9.15

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Solution

The fourth proportional to 10.28, 15.35 and 9.15 is: 13.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.28 : 15.35 = 9.15 : x
  2. Step 2: Convert to fraction form
    10.28/15.35 = 9.15/x
  3. Step 3: Cross multiply
    10.28x = 15.35 × 9.15
  4. Step 4: Simplify right side
    10.28x = 140.35
  5. Step 5: Solve for x
    x = 140.35/10.28
  6. Step 6: Final answer
    x = 13.65

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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.