Home / 1,381.50-2,072.31-407.69

Finding the Fourth Proportional to 1,381.50, 2,072.31 and 407.69

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Solution

The fourth proportional to 1,381.50, 2,072.31 and 407.69 is: 611.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.50 : 2,072.31 = 407.69 : x
  2. Step 2: Convert to fraction form
    1,381.50/2,072.31 = 407.69/x
  3. Step 3: Cross multiply
    1,381.50x = 2,072.31 × 407.69
  4. Step 4: Simplify right side
    1,381.50x = 844,849.70
  5. Step 5: Solve for x
    x = 844,849.70/1,381.50
  6. Step 6: Final answer
    x = 611.55

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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.