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Finding the Fourth Proportional to 672.88, 928.60 and 378.18

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Solution

The fourth proportional to 672.88, 928.60 and 378.18 is: 521.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.88 : 928.60 = 378.18 : x
  2. Step 2: Convert to fraction form
    672.88/928.60 = 378.18/x
  3. Step 3: Cross multiply
    672.88x = 928.60 × 378.18
  4. Step 4: Simplify right side
    672.88x = 351,177.95
  5. Step 5: Solve for x
    x = 351,177.95/672.88
  6. Step 6: Final answer
    x = 521.90

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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.