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Finding the Fourth Proportional to 2,153.58, 3,231.11 and 920.94

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Solution

The fourth proportional to 2,153.58, 3,231.11 and 920.94 is: 1,381.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,153.58 : 3,231.11 = 920.94 : x
  2. Step 2: Convert to fraction form
    2,153.58/3,231.11 = 920.94/x
  3. Step 3: Cross multiply
    2,153.58x = 3,231.11 × 920.94
  4. Step 4: Simplify right side
    2,153.58x = 2,975,658.44
  5. Step 5: Solve for x
    x = 2,975,658.44/2,153.58
  6. Step 6: Final answer
    x = 1,381.73

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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.