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Finding the Fourth Proportional to 1,170.21, 1,755.66 and 439.85

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Solution

The fourth proportional to 1,170.21, 1,755.66 and 439.85 is: 659.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,170.21 : 1,755.66 = 439.85 : x
  2. Step 2: Convert to fraction form
    1,170.21/1,755.66 = 439.85/x
  3. Step 3: Cross multiply
    1,170.21x = 1,755.66 × 439.85
  4. Step 4: Simplify right side
    1,170.21x = 772,218.27
  5. Step 5: Solve for x
    x = 772,218.27/1,170.21
  6. Step 6: Final answer
    x = 659.90

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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.