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Finding the Fourth Proportional to 759.87, 1,139.67 and 211.92

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Solution

The fourth proportional to 759.87, 1,139.67 and 211.92 is: 317.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.87 : 1,139.67 = 211.92 : x
  2. Step 2: Convert to fraction form
    759.87/1,139.67 = 211.92/x
  3. Step 3: Cross multiply
    759.87x = 1,139.67 × 211.92
  4. Step 4: Simplify right side
    759.87x = 241,518.87
  5. Step 5: Solve for x
    x = 241,518.87/759.87
  6. Step 6: Final answer
    x = 317.84

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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.