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Finding the Fourth Proportional to 550.79, 826.14 and 139.89

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Solution

The fourth proportional to 550.79, 826.14 and 139.89 is: 209.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    550.79 : 826.14 = 139.89 : x
  2. Step 2: Convert to fraction form
    550.79/826.14 = 139.89/x
  3. Step 3: Cross multiply
    550.79x = 826.14 × 139.89
  4. Step 4: Simplify right side
    550.79x = 115,568.72
  5. Step 5: Solve for x
    x = 115,568.72/550.79
  6. Step 6: Final answer
    x = 209.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.