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Finding the Fourth Proportional to 1,131.66, 1,693.80 and 855.90

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Solution

The fourth proportional to 1,131.66, 1,693.80 and 855.90 is: 1,281.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,131.66 : 1,693.80 = 855.90 : x
  2. Step 2: Convert to fraction form
    1,131.66/1,693.80 = 855.90/x
  3. Step 3: Cross multiply
    1,131.66x = 1,693.80 × 855.90
  4. Step 4: Simplify right side
    1,131.66x = 1,449,723.42
  5. Step 5: Solve for x
    x = 1,449,723.42/1,131.66
  6. Step 6: Final answer
    x = 1,281.06

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.