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Finding the Fourth Proportional to 1,245.46, 1,868.39 and 423.65

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Solution

The fourth proportional to 1,245.46, 1,868.39 and 423.65 is: 635.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,245.46 : 1,868.39 = 423.65 : x
  2. Step 2: Convert to fraction form
    1,245.46/1,868.39 = 423.65/x
  3. Step 3: Cross multiply
    1,245.46x = 1,868.39 × 423.65
  4. Step 4: Simplify right side
    1,245.46x = 791,535.14
  5. Step 5: Solve for x
    x = 791,535.14/1,245.46
  6. Step 6: Final answer
    x = 635.54

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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.