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Finding the Fourth Proportional to 259.55, 387.48 and 220.62

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Solution

The fourth proportional to 259.55, 387.48 and 220.62 is: 329.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    259.55 : 387.48 = 220.62 : x
  2. Step 2: Convert to fraction form
    259.55/387.48 = 220.62/x
  3. Step 3: Cross multiply
    259.55x = 387.48 × 220.62
  4. Step 4: Simplify right side
    259.55x = 85,488.12
  5. Step 5: Solve for x
    x = 85,488.12/259.55
  6. Step 6: Final answer
    x = 329.36

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.