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Finding the Fourth Proportional to 1,180.92, 1,770.80 and 687.49

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Solution

The fourth proportional to 1,180.92, 1,770.80 and 687.49 is: 1,030.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,180.92 : 1,770.80 = 687.49 : x
  2. Step 2: Convert to fraction form
    1,180.92/1,770.80 = 687.49/x
  3. Step 3: Cross multiply
    1,180.92x = 1,770.80 × 687.49
  4. Step 4: Simplify right side
    1,180.92x = 1,217,409.39
  5. Step 5: Solve for x
    x = 1,217,409.39/1,180.92
  6. Step 6: Final answer
    x = 1,030.90

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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.