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Finding the Fourth Proportional to 45.98, 68.99 and 13.92

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Solution

The fourth proportional to 45.98, 68.99 and 13.92 is: 20.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.98 : 68.99 = 13.92 : x
  2. Step 2: Convert to fraction form
    45.98/68.99 = 13.92/x
  3. Step 3: Cross multiply
    45.98x = 68.99 × 13.92
  4. Step 4: Simplify right side
    45.98x = 960.40
  5. Step 5: Solve for x
    x = 960.40/45.98
  6. Step 6: Final answer
    x = 20.89

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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.