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Finding the Fourth Proportional to 4.89, 7.29 and 4.47

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Solution

The fourth proportional to 4.89, 7.29 and 4.47 is: 6.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    4.89 : 7.29 = 4.47 : x
  2. Step 2: Convert to fraction form
    4.89/7.29 = 4.47/x
  3. Step 3: Cross multiply
    4.89x = 7.29 × 4.47
  4. Step 4: Simplify right side
    4.89x = 32.56
  5. Step 5: Solve for x
    x = 32.56/4.89
  6. Step 6: Final answer
    x = 6.65

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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.