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Finding the Fourth Proportional to 1,224.75, 1,689.91 and 727.21

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Solution

The fourth proportional to 1,224.75, 1,689.91 and 727.21 is: 1,003.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.75 : 1,689.91 = 727.21 : x
  2. Step 2: Convert to fraction form
    1,224.75/1,689.91 = 727.21/x
  3. Step 3: Cross multiply
    1,224.75x = 1,689.91 × 727.21
  4. Step 4: Simplify right side
    1,224.75x = 1,228,919.45
  5. Step 5: Solve for x
    x = 1,228,919.45/1,224.75
  6. Step 6: Final answer
    x = 1,003.40

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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.