Home / 1,381.29-2,072.09-407.39

Finding the Fourth Proportional to 1,381.29, 2,072.09 and 407.39

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Solution

The fourth proportional to 1,381.29, 2,072.09 and 407.39 is: 611.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.29 : 2,072.09 = 407.39 : x
  2. Step 2: Convert to fraction form
    1,381.29/2,072.09 = 407.39/x
  3. Step 3: Cross multiply
    1,381.29x = 2,072.09 × 407.39
  4. Step 4: Simplify right side
    1,381.29x = 844,136.35
  5. Step 5: Solve for x
    x = 844,136.35/1,381.29
  6. Step 6: Final answer
    x = 611.12

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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.