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Finding the Fourth Proportional to 5.28, 7.87 and 5.19

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Solution

The fourth proportional to 5.28, 7.87 and 5.19 is: 7.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    5.28 : 7.87 = 5.19 : x
  2. Step 2: Convert to fraction form
    5.28/7.87 = 5.19/x
  3. Step 3: Cross multiply
    5.28x = 7.87 × 5.19
  4. Step 4: Simplify right side
    5.28x = 40.85
  5. Step 5: Solve for x
    x = 40.85/5.28
  6. Step 6: Final answer
    x = 7.74

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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.