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Finding the Fourth Proportional to 7.15, 10.67 and 5.86

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Solution

The fourth proportional to 7.15, 10.67 and 5.86 is: 8.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.15 : 10.67 = 5.86 : x
  2. Step 2: Convert to fraction form
    7.15/10.67 = 5.86/x
  3. Step 3: Cross multiply
    7.15x = 10.67 × 5.86
  4. Step 4: Simplify right side
    7.15x = 62.59
  5. Step 5: Solve for x
    x = 62.59/7.15
  6. Step 6: Final answer
    x = 8.76

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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.