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Finding the Fourth Proportional to 675.50, 932.20 and 380.78

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Solution

The fourth proportional to 675.50, 932.20 and 380.78 is: 525.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    675.50 : 932.20 = 380.78 : x
  2. Step 2: Convert to fraction form
    675.50/932.20 = 380.78/x
  3. Step 3: Cross multiply
    675.50x = 932.20 × 380.78
  4. Step 4: Simplify right side
    675.50x = 354,963.12
  5. Step 5: Solve for x
    x = 354,963.12/675.50
  6. Step 6: Final answer
    x = 525.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.