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Finding the Fourth Proportional to 843.82, 1,255.70 and 811.01

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Solution

The fourth proportional to 843.82, 1,255.70 and 811.01 is: 1,206.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    843.82 : 1,255.70 = 811.01 : x
  2. Step 2: Convert to fraction form
    843.82/1,255.70 = 811.01/x
  3. Step 3: Cross multiply
    843.82x = 1,255.70 × 811.01
  4. Step 4: Simplify right side
    843.82x = 1,018,390.42
  5. Step 5: Solve for x
    x = 1,018,390.42/843.82
  6. Step 6: Final answer
    x = 1,206.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.