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Finding the Fourth Proportional to 1,173.66, 1,761.21 and 687.66

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Solution

The fourth proportional to 1,173.66, 1,761.21 and 687.66 is: 1,031.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,173.66 : 1,761.21 = 687.66 : x
  2. Step 2: Convert to fraction form
    1,173.66/1,761.21 = 687.66/x
  3. Step 3: Cross multiply
    1,173.66x = 1,761.21 × 687.66
  4. Step 4: Simplify right side
    1,173.66x = 1,211,113.67
  5. Step 5: Solve for x
    x = 1,211,113.67/1,173.66
  6. Step 6: Final answer
    x = 1,031.91

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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.