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Finding the Fourth Proportional to 23.34, 32.18 and 21.18

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Solution

The fourth proportional to 23.34, 32.18 and 21.18 is: 29.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    23.34 : 32.18 = 21.18 : x
  2. Step 2: Convert to fraction form
    23.34/32.18 = 21.18/x
  3. Step 3: Cross multiply
    23.34x = 32.18 × 21.18
  4. Step 4: Simplify right side
    23.34x = 681.57
  5. Step 5: Solve for x
    x = 681.57/23.34
  6. Step 6: Final answer
    x = 29.20

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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.