Home / 1,821.20-2,513.49-1,231.70

Finding the Fourth Proportional to 1,821.20, 2,513.49 and 1,231.70

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Solution

The fourth proportional to 1,821.20, 2,513.49 and 1,231.70 is: 1,699.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,821.20 : 2,513.49 = 1,231.70 : x
  2. Step 2: Convert to fraction form
    1,821.20/2,513.49 = 1,231.70/x
  3. Step 3: Cross multiply
    1,821.20x = 2,513.49 × 1,231.70
  4. Step 4: Simplify right side
    1,821.20x = 3,095,865.63
  5. Step 5: Solve for x
    x = 3,095,865.63/1,821.20
  6. Step 6: Final answer
    x = 1,699.90

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.