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Finding the Fourth Proportional to 43.25, 64.89 and 21.89

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Solution

The fourth proportional to 43.25, 64.89 and 21.89 is: 32.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.25 : 64.89 = 21.89 : x
  2. Step 2: Convert to fraction form
    43.25/64.89 = 21.89/x
  3. Step 3: Cross multiply
    43.25x = 64.89 × 21.89
  4. Step 4: Simplify right side
    43.25x = 1,420.44
  5. Step 5: Solve for x
    x = 1,420.44/43.25
  6. Step 6: Final answer
    x = 32.84

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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.