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Finding the Fourth Proportional to 877.56, 1,211.58 and 611.92

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Solution

The fourth proportional to 877.56, 1,211.58 and 611.92 is: 844.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.56 : 1,211.58 = 611.92 : x
  2. Step 2: Convert to fraction form
    877.56/1,211.58 = 611.92/x
  3. Step 3: Cross multiply
    877.56x = 1,211.58 × 611.92
  4. Step 4: Simplify right side
    877.56x = 741,390.03
  5. Step 5: Solve for x
    x = 741,390.03/877.56
  6. Step 6: Final answer
    x = 844.83

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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.