Home / 1,231.10-1,846.20-409.40

Finding the Fourth Proportional to 1,231.10, 1,846.20 and 409.40

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Solution

The fourth proportional to 1,231.10, 1,846.20 and 409.40 is: 613.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,231.10 : 1,846.20 = 409.40 : x
  2. Step 2: Convert to fraction form
    1,231.10/1,846.20 = 409.40/x
  3. Step 3: Cross multiply
    1,231.10x = 1,846.20 × 409.40
  4. Step 4: Simplify right side
    1,231.10x = 755,834.28
  5. Step 5: Solve for x
    x = 755,834.28/1,231.10
  6. Step 6: Final answer
    x = 613.95

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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.