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Finding the Fourth Proportional to 636.38, 879.02 and 439.54

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Solution

The fourth proportional to 636.38, 879.02 and 439.54 is: 607.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    636.38 : 879.02 = 439.54 : x
  2. Step 2: Convert to fraction form
    636.38/879.02 = 439.54/x
  3. Step 3: Cross multiply
    636.38x = 879.02 × 439.54
  4. Step 4: Simplify right side
    636.38x = 386,364.45
  5. Step 5: Solve for x
    x = 386,364.45/636.38
  6. Step 6: Final answer
    x = 607.13

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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.