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Finding the Fourth Proportional to 759.63, 1,139.27 and 211.85

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Solution

The fourth proportional to 759.63, 1,139.27 and 211.85 is: 317.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.63 : 1,139.27 = 211.85 : x
  2. Step 2: Convert to fraction form
    759.63/1,139.27 = 211.85/x
  3. Step 3: Cross multiply
    759.63x = 1,139.27 × 211.85
  4. Step 4: Simplify right side
    759.63x = 241,351.87
  5. Step 5: Solve for x
    x = 241,351.87/759.63
  6. Step 6: Final answer
    x = 317.72

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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.