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Finding the Fourth Proportional to 325.18, 487.80 and 102.79

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Solution

The fourth proportional to 325.18, 487.80 and 102.79 is: 154.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.18 : 487.80 = 102.79 : x
  2. Step 2: Convert to fraction form
    325.18/487.80 = 102.79/x
  3. Step 3: Cross multiply
    325.18x = 487.80 × 102.79
  4. Step 4: Simplify right side
    325.18x = 50,140.96
  5. Step 5: Solve for x
    x = 50,140.96/325.18
  6. Step 6: Final answer
    x = 154.19

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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.