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Finding the Fourth Proportional to 4.87, 6.67 and 4.86

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Solution

The fourth proportional to 4.87, 6.67 and 4.86 is: 6.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.87 : 6.67 = 4.86 : x
  2. Step 2: Convert to fraction form
    4.87/6.67 = 4.86/x
  3. Step 3: Cross multiply
    4.87x = 6.67 × 4.86
  4. Step 4: Simplify right side
    4.87x = 32.41
  5. Step 5: Solve for x
    x = 32.41/4.87
  6. Step 6: Final answer
    x = 6.65

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.