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Finding the Fourth Proportional to 7,680.78, 11,520.63 and 2,750.13

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Solution

The fourth proportional to 7,680.78, 11,520.63 and 2,750.13 is: 4,125.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,680.78 : 11,520.63 = 2,750.13 : x
  2. Step 2: Convert to fraction form
    7,680.78/11,520.63 = 2,750.13/x
  3. Step 3: Cross multiply
    7,680.78x = 11,520.63 × 2,750.13
  4. Step 4: Simplify right side
    7,680.78x = 31,683,230.18
  5. Step 5: Solve for x
    x = 31,683,230.18/7,680.78
  6. Step 6: Final answer
    x = 4,125.00

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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.