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Finding the Fourth Proportional to 45.62, 68.40 and 19.92

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Solution

The fourth proportional to 45.62, 68.40 and 19.92 is: 29.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.62 : 68.40 = 19.92 : x
  2. Step 2: Convert to fraction form
    45.62/68.40 = 19.92/x
  3. Step 3: Cross multiply
    45.62x = 68.40 × 19.92
  4. Step 4: Simplify right side
    45.62x = 1,362.82
  5. Step 5: Solve for x
    x = 1,362.82/45.62
  6. Step 6: Final answer
    x = 29.88

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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.