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Finding the Fourth Proportional to 2,154.55, 3,231.84 and 920.92

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Solution

The fourth proportional to 2,154.55, 3,231.84 and 920.92 is: 1,381.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,154.55 : 3,231.84 = 920.92 : x
  2. Step 2: Convert to fraction form
    2,154.55/3,231.84 = 920.92/x
  3. Step 3: Cross multiply
    2,154.55x = 3,231.84 × 920.92
  4. Step 4: Simplify right side
    2,154.55x = 2,976,266.09
  5. Step 5: Solve for x
    x = 2,976,266.09/2,154.55
  6. Step 6: Final answer
    x = 1,381.39

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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.