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Finding the Fourth Proportional to 638.92, 880.86 and 559.40

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Solution

The fourth proportional to 638.92, 880.86 and 559.40 is: 771.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    638.92 : 880.86 = 559.40 : x
  2. Step 2: Convert to fraction form
    638.92/880.86 = 559.40/x
  3. Step 3: Cross multiply
    638.92x = 880.86 × 559.40
  4. Step 4: Simplify right side
    638.92x = 492,753.08
  5. Step 5: Solve for x
    x = 492,753.08/638.92
  6. Step 6: Final answer
    x = 771.23

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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.