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Finding the Fourth Proportional to 1,175.76, 1,763.91 and 689.22

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Solution

The fourth proportional to 1,175.76, 1,763.91 and 689.22 is: 1,033.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,175.76 : 1,763.91 = 689.22 : x
  2. Step 2: Convert to fraction form
    1,175.76/1,763.91 = 689.22/x
  3. Step 3: Cross multiply
    1,175.76x = 1,763.91 × 689.22
  4. Step 4: Simplify right side
    1,175.76x = 1,215,722.05
  5. Step 5: Solve for x
    x = 1,215,722.05/1,175.76
  6. Step 6: Final answer
    x = 1,033.99

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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.