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Finding the Fourth Proportional to 9,120.92, 12,578.49 and 5,757.93

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Solution

The fourth proportional to 9,120.92, 12,578.49 and 5,757.93 is: 7,940.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,120.92 : 12,578.49 = 5,757.93 : x
  2. Step 2: Convert to fraction form
    9,120.92/12,578.49 = 5,757.93/x
  3. Step 3: Cross multiply
    9,120.92x = 12,578.49 × 5,757.93
  4. Step 4: Simplify right side
    9,120.92x = 72,426,064.93
  5. Step 5: Solve for x
    x = 72,426,064.93/9,120.92
  6. Step 6: Final answer
    x = 7,940.66

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.