Home / 1,231.40-1,847.14-409.74

Finding the Fourth Proportional to 1,231.40, 1,847.14 and 409.74

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Solution

The fourth proportional to 1,231.40, 1,847.14 and 409.74 is: 614.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.40 : 1,847.14 = 409.74 : x
  2. Step 2: Convert to fraction form
    1,231.40/1,847.14 = 409.74/x
  3. Step 3: Cross multiply
    1,231.40x = 1,847.14 × 409.74
  4. Step 4: Simplify right side
    1,231.40x = 756,847.14
  5. Step 5: Solve for x
    x = 756,847.14/1,231.40
  6. Step 6: Final answer
    x = 614.62

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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.