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Finding the Fourth Proportional to 14.90, 20.42 and 14.50

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Solution

The fourth proportional to 14.90, 20.42 and 14.50 is: 19.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    14.90 : 20.42 = 14.50 : x
  2. Step 2: Convert to fraction form
    14.90/20.42 = 14.50/x
  3. Step 3: Cross multiply
    14.90x = 20.42 × 14.50
  4. Step 4: Simplify right side
    14.90x = 295.99
  5. Step 5: Solve for x
    x = 295.99/14.90
  6. Step 6: Final answer
    x = 19.86

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.