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Finding the Fourth Proportional to 833.72, 1,149.90 and 637.88

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Solution

The fourth proportional to 833.72, 1,149.90 and 637.88 is: 879.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    833.72 : 1,149.90 = 637.88 : x
  2. Step 2: Convert to fraction form
    833.72/1,149.90 = 637.88/x
  3. Step 3: Cross multiply
    833.72x = 1,149.90 × 637.88
  4. Step 4: Simplify right side
    833.72x = 733,498.21
  5. Step 5: Solve for x
    x = 733,498.21/833.72
  6. Step 6: Final answer
    x = 879.79

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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.