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Finding the Fourth Proportional to 852.21, 1,177.20 and 752.78

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Solution

The fourth proportional to 852.21, 1,177.20 and 752.78 is: 1,039.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    852.21 : 1,177.20 = 752.78 : x
  2. Step 2: Convert to fraction form
    852.21/1,177.20 = 752.78/x
  3. Step 3: Cross multiply
    852.21x = 1,177.20 × 752.78
  4. Step 4: Simplify right side
    852.21x = 886,172.62
  5. Step 5: Solve for x
    x = 886,172.62/852.21
  6. Step 6: Final answer
    x = 1,039.85

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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.