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Finding the Fourth Proportional to 9.15, 12.59 and 7.76

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Solution

The fourth proportional to 9.15, 12.59 and 7.76 is: 10.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.15 : 12.59 = 7.76 : x
  2. Step 2: Convert to fraction form
    9.15/12.59 = 7.76/x
  3. Step 3: Cross multiply
    9.15x = 12.59 × 7.76
  4. Step 4: Simplify right side
    9.15x = 97.72
  5. Step 5: Solve for x
    x = 97.72/9.15
  6. Step 6: Final answer
    x = 10.68

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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.