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Finding the Fourth Proportional to 21.66, 32.42 and 12.98

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Solution

The fourth proportional to 21.66, 32.42 and 12.98 is: 19.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.66 : 32.42 = 12.98 : x
  2. Step 2: Convert to fraction form
    21.66/32.42 = 12.98/x
  3. Step 3: Cross multiply
    21.66x = 32.42 × 12.98
  4. Step 4: Simplify right side
    21.66x = 420.81
  5. Step 5: Solve for x
    x = 420.81/21.66
  6. Step 6: Final answer
    x = 19.43

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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.