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Finding the Fourth Proportional to 877.87, 1,211.02 and 815.33

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Solution

The fourth proportional to 877.87, 1,211.02 and 815.33 is: 1,124.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.87 : 1,211.02 = 815.33 : x
  2. Step 2: Convert to fraction form
    877.87/1,211.02 = 815.33/x
  3. Step 3: Cross multiply
    877.87x = 1,211.02 × 815.33
  4. Step 4: Simplify right side
    877.87x = 987,381.93
  5. Step 5: Solve for x
    x = 987,381.93/877.87
  6. Step 6: Final answer
    x = 1,124.75

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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.