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Finding the Fourth Proportional to 880.42, 1,320.20 and 324.71

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Solution

The fourth proportional to 880.42, 1,320.20 and 324.71 is: 486.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    880.42 : 1,320.20 = 324.71 : x
  2. Step 2: Convert to fraction form
    880.42/1,320.20 = 324.71/x
  3. Step 3: Cross multiply
    880.42x = 1,320.20 × 324.71
  4. Step 4: Simplify right side
    880.42x = 428,680.09
  5. Step 5: Solve for x
    x = 428,680.09/880.42
  6. Step 6: Final answer
    x = 486.90

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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.