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Finding the Fourth Proportional to 7,138.54, 9,851.28 and 3,995.74

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Solution

The fourth proportional to 7,138.54, 9,851.28 and 3,995.74 is: 5,514.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,138.54 : 9,851.28 = 3,995.74 : x
  2. Step 2: Convert to fraction form
    7,138.54/9,851.28 = 3,995.74/x
  3. Step 3: Cross multiply
    7,138.54x = 9,851.28 × 3,995.74
  4. Step 4: Simplify right side
    7,138.54x = 39,363,153.55
  5. Step 5: Solve for x
    x = 39,363,153.55/7,138.54
  6. Step 6: Final answer
    x = 5,514.17

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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.