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Finding the Fourth Proportional to 1,381.04, 2,072.12 and 611

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Solution

The fourth proportional to 1,381.04, 2,072.12 and 611 is: 916.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,381.04 : 2,072.12 = 611 : x
  2. Step 2: Convert to fraction form
    1,381.04/2,072.12 = 611/x
  3. Step 3: Cross multiply
    1,381.04x = 2,072.12 × 611
  4. Step 4: Simplify right side
    1,381.04x = 1,266,065.32
  5. Step 5: Solve for x
    x = 1,266,065.32/1,381.04
  6. Step 6: Final answer
    x = 916.75

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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.