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Finding the Fourth Proportional to 1,759.86, 2,640.96 and 938.70

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Solution

The fourth proportional to 1,759.86, 2,640.96 and 938.70 is: 1,408.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,759.86 : 2,640.96 = 938.70 : x
  2. Step 2: Convert to fraction form
    1,759.86/2,640.96 = 938.70/x
  3. Step 3: Cross multiply
    1,759.86x = 2,640.96 × 938.70
  4. Step 4: Simplify right side
    1,759.86x = 2,479,055.95
  5. Step 5: Solve for x
    x = 2,479,055.95/1,759.86
  6. Step 6: Final answer
    x = 1,408.67

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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.