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Finding the Fourth Proportional to 672.90, 928.90 and 439.62

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Solution

The fourth proportional to 672.90, 928.90 and 439.62 is: 606.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.90 : 928.90 = 439.62 : x
  2. Step 2: Convert to fraction form
    672.90/928.90 = 439.62/x
  3. Step 3: Cross multiply
    672.90x = 928.90 × 439.62
  4. Step 4: Simplify right side
    672.90x = 408,363.02
  5. Step 5: Solve for x
    x = 408,363.02/672.90
  6. Step 6: Final answer
    x = 606.87

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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.