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Finding the Fourth Proportional to 15.85, 23.90 and 14.18

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Solution

The fourth proportional to 15.85, 23.90 and 14.18 is: 21.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    15.85 : 23.90 = 14.18 : x
  2. Step 2: Convert to fraction form
    15.85/23.90 = 14.18/x
  3. Step 3: Cross multiply
    15.85x = 23.90 × 14.18
  4. Step 4: Simplify right side
    15.85x = 338.90
  5. Step 5: Solve for x
    x = 338.90/15.85
  6. Step 6: Final answer
    x = 21.38

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.