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Finding the Fourth Proportional to 672.76, 928.29 and 439.75

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Solution

The fourth proportional to 672.76, 928.29 and 439.75 is: 606.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.76 : 928.29 = 439.75 : x
  2. Step 2: Convert to fraction form
    672.76/928.29 = 439.75/x
  3. Step 3: Cross multiply
    672.76x = 928.29 × 439.75
  4. Step 4: Simplify right side
    672.76x = 408,215.53
  5. Step 5: Solve for x
    x = 408,215.53/672.76
  6. Step 6: Final answer
    x = 606.78

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Half scale
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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.