Home / 1,381.25-2,072.18-407.30

Finding the Fourth Proportional to 1,381.25, 2,072.18 and 407.30

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Solution

The fourth proportional to 1,381.25, 2,072.18 and 407.30 is: 611.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.25 : 2,072.18 = 407.30 : x
  2. Step 2: Convert to fraction form
    1,381.25/2,072.18 = 407.30/x
  3. Step 3: Cross multiply
    1,381.25x = 2,072.18 × 407.30
  4. Step 4: Simplify right side
    1,381.25x = 843,989.57
  5. Step 5: Solve for x
    x = 843,989.57/1,381.25
  6. Step 6: Final answer
    x = 611.03

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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.