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Finding the Fourth Proportional to 2,138.35, 3,207.60 and 751.78

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Solution

The fourth proportional to 2,138.35, 3,207.60 and 751.78 is: 1,127.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.35 : 3,207.60 = 751.78 : x
  2. Step 2: Convert to fraction form
    2,138.35/3,207.60 = 751.78/x
  3. Step 3: Cross multiply
    2,138.35x = 3,207.60 × 751.78
  4. Step 4: Simplify right side
    2,138.35x = 2,411,413.54
  5. Step 5: Solve for x
    x = 2,411,413.54/2,138.35
  6. Step 6: Final answer
    x = 1,127.70

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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.