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Finding the Fourth Proportional to 5,228.78, 7,211.28 and 3,721.40

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Solution

The fourth proportional to 5,228.78, 7,211.28 and 3,721.40 is: 5,132.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,228.78 : 7,211.28 = 3,721.40 : x
  2. Step 2: Convert to fraction form
    5,228.78/7,211.28 = 3,721.40/x
  3. Step 3: Cross multiply
    5,228.78x = 7,211.28 × 3,721.40
  4. Step 4: Simplify right side
    5,228.78x = 26,836,057.39
  5. Step 5: Solve for x
    x = 26,836,057.39/5,228.78
  6. Step 6: Final answer
    x = 5,132.37

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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.