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Finding the Fourth Proportional to 4.89, 7.24 and 4.87

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Solution

The fourth proportional to 4.89, 7.24 and 4.87 is: 7.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.89 : 7.24 = 4.87 : x
  2. Step 2: Convert to fraction form
    4.89/7.24 = 4.87/x
  3. Step 3: Cross multiply
    4.89x = 7.24 × 4.87
  4. Step 4: Simplify right side
    4.89x = 35.26
  5. Step 5: Solve for x
    x = 35.26/4.89
  6. Step 6: Final answer
    x = 7.21

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Why These Related Problems?

These problems maintain the same ratio (1.48) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.