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Finding the Fourth Proportional to 921.26, 1,380.08 and 573.78

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Solution

The fourth proportional to 921.26, 1,380.08 and 573.78 is: 859.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.26 : 1,380.08 = 573.78 : x
  2. Step 2: Convert to fraction form
    921.26/1,380.08 = 573.78/x
  3. Step 3: Cross multiply
    921.26x = 1,380.08 × 573.78
  4. Step 4: Simplify right side
    921.26x = 791,862.30
  5. Step 5: Solve for x
    x = 791,862.30/921.26
  6. Step 6: Final answer
    x = 859.54

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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.