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Finding the Fourth Proportional to 1,174, 1,761.33 and 687.46

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Solution

The fourth proportional to 1,174, 1,761.33 and 687.46 is: 1,031.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,174 : 1,761.33 = 687.46 : x
  2. Step 2: Convert to fraction form
    1,174/1,761.33 = 687.46/x
  3. Step 3: Cross multiply
    1,174x = 1,761.33 × 687.46
  4. Step 4: Simplify right side
    1,174x = 1,210,843.92
  5. Step 5: Solve for x
    x = 1,210,843.92/1,174
  6. Step 6: Final answer
    x = 1,031.38

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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.