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Finding the Fourth Proportional to 5,261.87, 7,890.80 and 1,751.21

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Solution

The fourth proportional to 5,261.87, 7,890.80 and 1,751.21 is: 2,626.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,261.87 : 7,890.80 = 1,751.21 : x
  2. Step 2: Convert to fraction form
    5,261.87/7,890.80 = 1,751.21/x
  3. Step 3: Cross multiply
    5,261.87x = 7,890.80 × 1,751.21
  4. Step 4: Simplify right side
    5,261.87x = 13,818,399.66
  5. Step 5: Solve for x
    x = 13,818,399.66/5,261.87
  6. Step 6: Final answer
    x = 2,626.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.