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Finding the Fourth Proportional to 7.20, 9.92 and 4.89

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Solution

The fourth proportional to 7.20, 9.92 and 4.89 is: 6.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.20 : 9.92 = 4.89 : x
  2. Step 2: Convert to fraction form
    7.20/9.92 = 4.89/x
  3. Step 3: Cross multiply
    7.20x = 9.92 × 4.89
  4. Step 4: Simplify right side
    7.20x = 48.51
  5. Step 5: Solve for x
    x = 48.51/7.20
  6. Step 6: Final answer
    x = 6.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.