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Finding the Fourth Proportional to 2,153.90, 3,229.91 and 767.21

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Solution

The fourth proportional to 2,153.90, 3,229.91 and 767.21 is: 1,150.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,153.90 : 3,229.91 = 767.21 : x
  2. Step 2: Convert to fraction form
    2,153.90/3,229.91 = 767.21/x
  3. Step 3: Cross multiply
    2,153.90x = 3,229.91 × 767.21
  4. Step 4: Simplify right side
    2,153.90x = 2,478,019.25
  5. Step 5: Solve for x
    x = 2,478,019.25/2,153.90
  6. Step 6: Final answer
    x = 1,150.48

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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.