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Finding the Fourth Proportional to 628.75, 938.32 and 550.86

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Solution

The fourth proportional to 628.75, 938.32 and 550.86 is: 822.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.75 : 938.32 = 550.86 : x
  2. Step 2: Convert to fraction form
    628.75/938.32 = 550.86/x
  3. Step 3: Cross multiply
    628.75x = 938.32 × 550.86
  4. Step 4: Simplify right side
    628.75x = 516,882.96
  5. Step 5: Solve for x
    x = 516,882.96/628.75
  6. Step 6: Final answer
    x = 822.08

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.