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Finding the Fourth Proportional to 759.60, 1,139.34 and 211.74

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Solution

The fourth proportional to 759.60, 1,139.34 and 211.74 is: 317.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    759.60 : 1,139.34 = 211.74 : x
  2. Step 2: Convert to fraction form
    759.60/1,139.34 = 211.74/x
  3. Step 3: Cross multiply
    759.60x = 1,139.34 × 211.74
  4. Step 4: Simplify right side
    759.60x = 241,243.85
  5. Step 5: Solve for x
    x = 241,243.85/759.60
  6. Step 6: Final answer
    x = 317.59

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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.