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Finding the Fourth Proportional to 43.47, 65.25 and 28.21

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Solution

The fourth proportional to 43.47, 65.25 and 28.21 is: 42.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.47 : 65.25 = 28.21 : x
  2. Step 2: Convert to fraction form
    43.47/65.25 = 28.21/x
  3. Step 3: Cross multiply
    43.47x = 65.25 × 28.21
  4. Step 4: Simplify right side
    43.47x = 1,840.70
  5. Step 5: Solve for x
    x = 1,840.70/43.47
  6. Step 6: Final answer
    x = 42.34

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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.