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Finding the Fourth Proportional to 7.92, 11.88 and 4.87

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Solution

The fourth proportional to 7.92, 11.88 and 4.87 is: 7.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.92 : 11.88 = 4.87 : x
  2. Step 2: Convert to fraction form
    7.92/11.88 = 4.87/x
  3. Step 3: Cross multiply
    7.92x = 11.88 × 4.87
  4. Step 4: Simplify right side
    7.92x = 57.86
  5. Step 5: Solve for x
    x = 57.86/7.92
  6. Step 6: Final answer
    x = 7.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.