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Finding the Fourth Proportional to 3,900.87, 5,379.11 and 2,572.88

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Solution

The fourth proportional to 3,900.87, 5,379.11 and 2,572.88 is: 3,547.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,900.87 : 5,379.11 = 2,572.88 : x
  2. Step 2: Convert to fraction form
    3,900.87/5,379.11 = 2,572.88/x
  3. Step 3: Cross multiply
    3,900.87x = 5,379.11 × 2,572.88
  4. Step 4: Simplify right side
    3,900.87x = 13,839,804.54
  5. Step 5: Solve for x
    x = 13,839,804.54/3,900.87
  6. Step 6: Final answer
    x = 3,547.88

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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.