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Finding the Fourth Proportional to 10.28, 15.42 and 5.19

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Solution

The fourth proportional to 10.28, 15.42 and 5.19 is: 7.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.28 : 15.42 = 5.19 : x
  2. Step 2: Convert to fraction form
    10.28/15.42 = 5.19/x
  3. Step 3: Cross multiply
    10.28x = 15.42 × 5.19
  4. Step 4: Simplify right side
    10.28x = 79.99
  5. Step 5: Solve for x
    x = 79.99/10.28
  6. Step 6: Final answer
    x = 7.78

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.