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Finding the Fourth Proportional to 7,661.78, 11,490.16 and 2,981.46

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Solution

The fourth proportional to 7,661.78, 11,490.16 and 2,981.46 is: 4,471.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,661.78 : 11,490.16 = 2,981.46 : x
  2. Step 2: Convert to fraction form
    7,661.78/11,490.16 = 2,981.46/x
  3. Step 3: Cross multiply
    7,661.78x = 11,490.16 × 2,981.46
  4. Step 4: Simplify right side
    7,661.78x = 34,257,452.43
  5. Step 5: Solve for x
    x = 34,257,452.43/7,661.78
  6. Step 6: Final answer
    x = 4,471.21

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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.