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Finding the Fourth Proportional to 325.49, 487.19 and 171.20

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Solution

The fourth proportional to 325.49, 487.19 and 171.20 is: 256.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.49 : 487.19 = 171.20 : x
  2. Step 2: Convert to fraction form
    325.49/487.19 = 171.20/x
  3. Step 3: Cross multiply
    325.49x = 487.19 × 171.20
  4. Step 4: Simplify right side
    325.49x = 83,406.93
  5. Step 5: Solve for x
    x = 83,406.93/325.49
  6. Step 6: Final answer
    x = 256.25

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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.