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Finding the Fourth Proportional to 672.85, 928.49 and 378.13

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Solution

The fourth proportional to 672.85, 928.49 and 378.13 is: 521.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.85 : 928.49 = 378.13 : x
  2. Step 2: Convert to fraction form
    672.85/928.49 = 378.13/x
  3. Step 3: Cross multiply
    672.85x = 928.49 × 378.13
  4. Step 4: Simplify right side
    672.85x = 351,085.28
  5. Step 5: Solve for x
    x = 351,085.28/672.85
  6. Step 6: Final answer
    x = 521.79

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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.