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Finding the Fourth Proportional to 5.30, 7.89 and 5.18

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Solution

The fourth proportional to 5.30, 7.89 and 5.18 is: 7.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.30 : 7.89 = 5.18 : x
  2. Step 2: Convert to fraction form
    5.30/7.89 = 5.18/x
  3. Step 3: Cross multiply
    5.30x = 7.89 × 5.18
  4. Step 4: Simplify right side
    5.30x = 40.87
  5. Step 5: Solve for x
    x = 40.87/5.30
  6. Step 6: Final answer
    x = 7.71

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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.