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Finding the Fourth Proportional to 7,987.50, 11,983.20 and 2,515.50

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Solution

The fourth proportional to 7,987.50, 11,983.20 and 2,515.50 is: 3,773.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,987.50 : 11,983.20 = 2,515.50 : x
  2. Step 2: Convert to fraction form
    7,987.50/11,983.20 = 2,515.50/x
  3. Step 3: Cross multiply
    7,987.50x = 11,983.20 × 2,515.50
  4. Step 4: Simplify right side
    7,987.50x = 30,143,739.60
  5. Step 5: Solve for x
    x = 30,143,739.60/7,987.50
  6. Step 6: Final answer
    x = 3,773.86

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1.5x scale

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.