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Finding the Fourth Proportional to 785.38, 1,175.84 and 687.37

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Solution

The fourth proportional to 785.38, 1,175.84 and 687.37 is: 1,029.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    785.38 : 1,175.84 = 687.37 : x
  2. Step 2: Convert to fraction form
    785.38/1,175.84 = 687.37/x
  3. Step 3: Cross multiply
    785.38x = 1,175.84 × 687.37
  4. Step 4: Simplify right side
    785.38x = 808,238.86
  5. Step 5: Solve for x
    x = 808,238.86/785.38
  6. Step 6: Final answer
    x = 1,029.11

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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.