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Finding the Fourth Proportional to 672.87, 928.55 and 378.19

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Solution

The fourth proportional to 672.87, 928.55 and 378.19 is: 521.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.87 : 928.55 = 378.19 : x
  2. Step 2: Convert to fraction form
    672.87/928.55 = 378.19/x
  3. Step 3: Cross multiply
    672.87x = 928.55 × 378.19
  4. Step 4: Simplify right side
    672.87x = 351,166.95
  5. Step 5: Solve for x
    x = 351,166.95/672.87
  6. Step 6: Final answer
    x = 521.89

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Double scale
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1.5x scale

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.