Home / 1,392.85-1,918.20-1,215.73

Finding the Fourth Proportional to 1,392.85, 1,918.20 and 1,215.73

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Solution

The fourth proportional to 1,392.85, 1,918.20 and 1,215.73 is: 1,674.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,392.85 : 1,918.20 = 1,215.73 : x
  2. Step 2: Convert to fraction form
    1,392.85/1,918.20 = 1,215.73/x
  3. Step 3: Cross multiply
    1,392.85x = 1,918.20 × 1,215.73
  4. Step 4: Simplify right side
    1,392.85x = 2,332,013.29
  5. Step 5: Solve for x
    x = 2,332,013.29/1,392.85
  6. Step 6: Final answer
    x = 1,674.27

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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.