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Finding the Fourth Proportional to 877.22, 1,209.92 and 611.66

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Solution

The fourth proportional to 877.22, 1,209.92 and 611.66 is: 843.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.22 : 1,209.92 = 611.66 : x
  2. Step 2: Convert to fraction form
    877.22/1,209.92 = 611.66/x
  3. Step 3: Cross multiply
    877.22x = 1,209.92 × 611.66
  4. Step 4: Simplify right side
    877.22x = 740,059.67
  5. Step 5: Solve for x
    x = 740,059.67/877.22
  6. Step 6: Final answer
    x = 843.64

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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.