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Finding the Fourth Proportional to 39.80, 59.69 and 14.12

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Solution

The fourth proportional to 39.80, 59.69 and 14.12 is: 21.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    39.80 : 59.69 = 14.12 : x
  2. Step 2: Convert to fraction form
    39.80/59.69 = 14.12/x
  3. Step 3: Cross multiply
    39.80x = 59.69 × 14.12
  4. Step 4: Simplify right side
    39.80x = 842.75
  5. Step 5: Solve for x
    x = 842.75/39.80
  6. Step 6: Final answer
    x = 21.17

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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.