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Finding the Fourth Proportional to 672.48, 928.19 and 423.61

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Solution

The fourth proportional to 672.48, 928.19 and 423.61 is: 584.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    672.48 : 928.19 = 423.61 : x
  2. Step 2: Convert to fraction form
    672.48/928.19 = 423.61/x
  3. Step 3: Cross multiply
    672.48x = 928.19 × 423.61
  4. Step 4: Simplify right side
    672.48x = 393,189.30
  5. Step 5: Solve for x
    x = 393,189.30/672.48
  6. Step 6: Final answer
    x = 584.69

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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.