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Finding the Fourth Proportional to 811.56, 1,125.20 and 767.80

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Solution

The fourth proportional to 811.56, 1,125.20 and 767.80 is: 1,064.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    811.56 : 1,125.20 = 767.80 : x
  2. Step 2: Convert to fraction form
    811.56/1,125.20 = 767.80/x
  3. Step 3: Cross multiply
    811.56x = 1,125.20 × 767.80
  4. Step 4: Simplify right side
    811.56x = 863,928.56
  5. Step 5: Solve for x
    x = 863,928.56/811.56
  6. Step 6: Final answer
    x = 1,064.53

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.