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Finding the Fourth Proportional to 10.13, 15.18 and 9.80

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Solution

The fourth proportional to 10.13, 15.18 and 9.80 is: 14.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    10.13 : 15.18 = 9.80 : x
  2. Step 2: Convert to fraction form
    10.13/15.18 = 9.80/x
  3. Step 3: Cross multiply
    10.13x = 15.18 × 9.80
  4. Step 4: Simplify right side
    10.13x = 148.69
  5. Step 5: Solve for x
    x = 148.69/10.13
  6. Step 6: Final answer
    x = 14.69

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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.