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Finding the Fourth Proportional to 1,175.78, 1,764.04 and 687.80

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Solution

The fourth proportional to 1,175.78, 1,764.04 and 687.80 is: 1,031.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,175.78 : 1,764.04 = 687.80 : x
  2. Step 2: Convert to fraction form
    1,175.78/1,764.04 = 687.80/x
  3. Step 3: Cross multiply
    1,175.78x = 1,764.04 × 687.80
  4. Step 4: Simplify right side
    1,175.78x = 1,213,306.71
  5. Step 5: Solve for x
    x = 1,213,306.71/1,175.78
  6. Step 6: Final answer
    x = 1,031.92

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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.