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Finding the Fourth Proportional to 9.15, 12.69 and 9.03

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Solution

The fourth proportional to 9.15, 12.69 and 9.03 is: 12.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.15 : 12.69 = 9.03 : x
  2. Step 2: Convert to fraction form
    9.15/12.69 = 9.03/x
  3. Step 3: Cross multiply
    9.15x = 12.69 × 9.03
  4. Step 4: Simplify right side
    9.15x = 114.59
  5. Step 5: Solve for x
    x = 114.59/9.15
  6. Step 6: Final answer
    x = 12.52

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.