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Finding the Fourth Proportional to 7,138.78, 9,851.97 and 3,995.20

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Solution

The fourth proportional to 7,138.78, 9,851.97 and 3,995.20 is: 5,513.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,138.78 : 9,851.97 = 3,995.20 : x
  2. Step 2: Convert to fraction form
    7,138.78/9,851.97 = 3,995.20/x
  3. Step 3: Cross multiply
    7,138.78x = 9,851.97 × 3,995.20
  4. Step 4: Simplify right side
    7,138.78x = 39,360,590.54
  5. Step 5: Solve for x
    x = 39,360,590.54/7,138.78
  6. Step 6: Final answer
    x = 5,513.63

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1.5x scale

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.