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Finding the Fourth Proportional to 1,550.21, 2,138.94 and 920.63

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Solution

The fourth proportional to 1,550.21, 2,138.94 and 920.63 is: 1,270.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,550.21 : 2,138.94 = 920.63 : x
  2. Step 2: Convert to fraction form
    1,550.21/2,138.94 = 920.63/x
  3. Step 3: Cross multiply
    1,550.21x = 2,138.94 × 920.63
  4. Step 4: Simplify right side
    1,550.21x = 1,969,177.68
  5. Step 5: Solve for x
    x = 1,969,177.68/1,550.21
  6. Step 6: Final answer
    x = 1,270.27

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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.