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Finding the Fourth Proportional to 13.98, 19.29 and 8.15

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Solution

The fourth proportional to 13.98, 19.29 and 8.15 is: 11.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    13.98 : 19.29 = 8.15 : x
  2. Step 2: Convert to fraction form
    13.98/19.29 = 8.15/x
  3. Step 3: Cross multiply
    13.98x = 19.29 × 8.15
  4. Step 4: Simplify right side
    13.98x = 157.29
  5. Step 5: Solve for x
    x = 157.29/13.98
  6. Step 6: Final answer
    x = 11.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.