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Finding the Fourth Proportional to 7,755.78, 11,633.79 and 1,912.40

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Solution

The fourth proportional to 7,755.78, 11,633.79 and 1,912.40 is: 2,868.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,755.78 : 11,633.79 = 1,912.40 : x
  2. Step 2: Convert to fraction form
    7,755.78/11,633.79 = 1,912.40/x
  3. Step 3: Cross multiply
    7,755.78x = 11,633.79 × 1,912.40
  4. Step 4: Simplify right side
    7,755.78x = 22,248,401.83
  5. Step 5: Solve for x
    x = 22,248,401.83/7,755.78
  6. Step 6: Final answer
    x = 2,868.62

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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.