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Finding the Fourth Proportional to 10.20, 15.19 and 9.42

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Solution

The fourth proportional to 10.20, 15.19 and 9.42 is: 14.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.20 : 15.19 = 9.42 : x
  2. Step 2: Convert to fraction form
    10.20/15.19 = 9.42/x
  3. Step 3: Cross multiply
    10.20x = 15.19 × 9.42
  4. Step 4: Simplify right side
    10.20x = 143.09
  5. Step 5: Solve for x
    x = 143.09/10.20
  6. Step 6: Final answer
    x = 14.03

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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.