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Finding the Fourth Proportional to 5,251.28, 7,249.02 and 3,155

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Solution

The fourth proportional to 5,251.28, 7,249.02 and 3,155 is: 4,355.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,251.28 : 7,249.02 = 3,155 : x
  2. Step 2: Convert to fraction form
    5,251.28/7,249.02 = 3,155/x
  3. Step 3: Cross multiply
    5,251.28x = 7,249.02 × 3,155
  4. Step 4: Simplify right side
    5,251.28x = 22,870,658.10
  5. Step 5: Solve for x
    x = 22,870,658.10/5,251.28
  6. Step 6: Final answer
    x = 4,355.25

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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.