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Finding the Fourth Proportional to 45.29, 67.90 and 21.23

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Solution

The fourth proportional to 45.29, 67.90 and 21.23 is: 31.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    45.29 : 67.90 = 21.23 : x
  2. Step 2: Convert to fraction form
    45.29/67.90 = 21.23/x
  3. Step 3: Cross multiply
    45.29x = 67.90 × 21.23
  4. Step 4: Simplify right side
    45.29x = 1,441.41
  5. Step 5: Solve for x
    x = 1,441.41/45.29
  6. Step 6: Final answer
    x = 31.83

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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.