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Finding the Fourth Proportional to 45.36, 67.98 and 21.27

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Solution

The fourth proportional to 45.36, 67.98 and 21.27 is: 31.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.36 : 67.98 = 21.27 : x
  2. Step 2: Convert to fraction form
    45.36/67.98 = 21.27/x
  3. Step 3: Cross multiply
    45.36x = 67.98 × 21.27
  4. Step 4: Simplify right side
    45.36x = 1,445.93
  5. Step 5: Solve for x
    x = 1,445.93/45.36
  6. Step 6: Final answer
    x = 31.88

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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.