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Finding the Fourth Proportional to 2,229.75, 3,345.12 and 768.87

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Solution

The fourth proportional to 2,229.75, 3,345.12 and 768.87 is: 1,153.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,229.75 : 3,345.12 = 768.87 : x
  2. Step 2: Convert to fraction form
    2,229.75/3,345.12 = 768.87/x
  3. Step 3: Cross multiply
    2,229.75x = 3,345.12 × 768.87
  4. Step 4: Simplify right side
    2,229.75x = 2,571,962.41
  5. Step 5: Solve for x
    x = 2,571,962.41/2,229.75
  6. Step 6: Final answer
    x = 1,153.48

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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.