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Finding the Fourth Proportional to 3,100.78, 4,279.20 and 1,703.50

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Solution

The fourth proportional to 3,100.78, 4,279.20 and 1,703.50 is: 2,350.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,100.78 : 4,279.20 = 1,703.50 : x
  2. Step 2: Convert to fraction form
    3,100.78/4,279.20 = 1,703.50/x
  3. Step 3: Cross multiply
    3,100.78x = 4,279.20 × 1,703.50
  4. Step 4: Simplify right side
    3,100.78x = 7,289,617.20
  5. Step 5: Solve for x
    x = 7,289,617.20/3,100.78
  6. Step 6: Final answer
    x = 2,350.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.