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Finding the Fourth Proportional to 438.55, 660.85 and 363.21

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Solution

The fourth proportional to 438.55, 660.85 and 363.21 is: 547.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    438.55 : 660.85 = 363.21 : x
  2. Step 2: Convert to fraction form
    438.55/660.85 = 363.21/x
  3. Step 3: Cross multiply
    438.55x = 660.85 × 363.21
  4. Step 4: Simplify right side
    438.55x = 240,027.33
  5. Step 5: Solve for x
    x = 240,027.33/438.55
  6. Step 6: Final answer
    x = 547.32

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.