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Finding the Fourth Proportional to 1,243.74, 1,865.87 and 421.99

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Solution

The fourth proportional to 1,243.74, 1,865.87 and 421.99 is: 633.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,243.74 : 1,865.87 = 421.99 : x
  2. Step 2: Convert to fraction form
    1,243.74/1,865.87 = 421.99/x
  3. Step 3: Cross multiply
    1,243.74x = 1,865.87 × 421.99
  4. Step 4: Simplify right side
    1,243.74x = 787,376.37
  5. Step 5: Solve for x
    x = 787,376.37/1,243.74
  6. Step 6: Final answer
    x = 633.07

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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.