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Finding the Fourth Proportional to 672.25, 928.11 and 439.78

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Solution

The fourth proportional to 672.25, 928.11 and 439.78 is: 607.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.25 : 928.11 = 439.78 : x
  2. Step 2: Convert to fraction form
    672.25/928.11 = 439.78/x
  3. Step 3: Cross multiply
    672.25x = 928.11 × 439.78
  4. Step 4: Simplify right side
    672.25x = 408,164.22
  5. Step 5: Solve for x
    x = 408,164.22/672.25
  6. Step 6: Final answer
    x = 607.16

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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.