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Finding the Fourth Proportional to 854.07, 1,177.79 and 687.75

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Solution

The fourth proportional to 854.07, 1,177.79 and 687.75 is: 948.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    854.07 : 1,177.79 = 687.75 : x
  2. Step 2: Convert to fraction form
    854.07/1,177.79 = 687.75/x
  3. Step 3: Cross multiply
    854.07x = 1,177.79 × 687.75
  4. Step 4: Simplify right side
    854.07x = 810,021.63
  5. Step 5: Solve for x
    x = 810,021.63/854.07
  6. Step 6: Final answer
    x = 948.43

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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.