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Finding the Fourth Proportional to 1,180.72, 1,770.84 and 661.24

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Solution

The fourth proportional to 1,180.72, 1,770.84 and 661.24 is: 991.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,180.72 : 1,770.84 = 661.24 : x
  2. Step 2: Convert to fraction form
    1,180.72/1,770.84 = 661.24/x
  3. Step 3: Cross multiply
    1,180.72x = 1,770.84 × 661.24
  4. Step 4: Simplify right side
    1,180.72x = 1,170,950.24
  5. Step 5: Solve for x
    x = 1,170,950.24/1,180.72
  6. Step 6: Final answer
    x = 991.73

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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.