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Finding the Fourth Proportional to 43.08, 64.65 and 20.25

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Solution

The fourth proportional to 43.08, 64.65 and 20.25 is: 30.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    43.08 : 64.65 = 20.25 : x
  2. Step 2: Convert to fraction form
    43.08/64.65 = 20.25/x
  3. Step 3: Cross multiply
    43.08x = 64.65 × 20.25
  4. Step 4: Simplify right side
    43.08x = 1,309.16
  5. Step 5: Solve for x
    x = 1,309.16/43.08
  6. Step 6: Final answer
    x = 30.39

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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.