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Finding the Fourth Proportional to 21.54, 32.15 and 18.98

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Solution

The fourth proportional to 21.54, 32.15 and 18.98 is: 28.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    21.54 : 32.15 = 18.98 : x
  2. Step 2: Convert to fraction form
    21.54/32.15 = 18.98/x
  3. Step 3: Cross multiply
    21.54x = 32.15 × 18.98
  4. Step 4: Simplify right side
    21.54x = 609.95
  5. Step 5: Solve for x
    x = 609.95/21.54
  6. Step 6: Final answer
    x = 28.32

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.