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Finding the Fourth Proportional to 1,243.20, 1,863.54 and 421.20

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Solution

The fourth proportional to 1,243.20, 1,863.54 and 421.20 is: 631.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.20 : 1,863.54 = 421.20 : x
  2. Step 2: Convert to fraction form
    1,243.20/1,863.54 = 421.20/x
  3. Step 3: Cross multiply
    1,243.20x = 1,863.54 × 421.20
  4. Step 4: Simplify right side
    1,243.20x = 784,923.05
  5. Step 5: Solve for x
    x = 784,923.05/1,243.20
  6. Step 6: Final answer
    x = 631.37

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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.