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Finding the Fourth Proportional to 9.57, 13.21 and 7.15

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Solution

The fourth proportional to 9.57, 13.21 and 7.15 is: 9.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.57 : 13.21 = 7.15 : x
  2. Step 2: Convert to fraction form
    9.57/13.21 = 7.15/x
  3. Step 3: Cross multiply
    9.57x = 13.21 × 7.15
  4. Step 4: Simplify right side
    9.57x = 94.45
  5. Step 5: Solve for x
    x = 94.45/9.57
  6. Step 6: Final answer
    x = 9.87

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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.