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Finding the Fourth Proportional to 3,988.78, 5,500.20 and 3,898.06

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Solution

The fourth proportional to 3,988.78, 5,500.20 and 3,898.06 is: 5,375.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,988.78 : 5,500.20 = 3,898.06 : x
  2. Step 2: Convert to fraction form
    3,988.78/5,500.20 = 3,898.06/x
  3. Step 3: Cross multiply
    3,988.78x = 5,500.20 × 3,898.06
  4. Step 4: Simplify right side
    3,988.78x = 21,440,110.48
  5. Step 5: Solve for x
    x = 21,440,110.48/3,988.78
  6. Step 6: Final answer
    x = 5,375.11

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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.