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Finding the Fourth Proportional to 639.28, 882.86 and 550.59

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Solution

The fourth proportional to 639.28, 882.86 and 550.59 is: 760.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    639.28 : 882.86 = 550.59 : x
  2. Step 2: Convert to fraction form
    639.28/882.86 = 550.59/x
  3. Step 3: Cross multiply
    639.28x = 882.86 × 550.59
  4. Step 4: Simplify right side
    639.28x = 486,093.89
  5. Step 5: Solve for x
    x = 486,093.89/639.28
  6. Step 6: Final answer
    x = 760.38

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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.