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Finding the Fourth Proportional to 32.85, 45.31 and 21.18

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Solution

The fourth proportional to 32.85, 45.31 and 21.18 is: 29.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    32.85 : 45.31 = 21.18 : x
  2. Step 2: Convert to fraction form
    32.85/45.31 = 21.18/x
  3. Step 3: Cross multiply
    32.85x = 45.31 × 21.18
  4. Step 4: Simplify right side
    32.85x = 959.67
  5. Step 5: Solve for x
    x = 959.67/32.85
  6. Step 6: Final answer
    x = 29.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.