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Finding the Fourth Proportional to 1,266.67, 1,901.22 and 1,187.10

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Solution

The fourth proportional to 1,266.67, 1,901.22 and 1,187.10 is: 1,781.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,266.67 : 1,901.22 = 1,187.10 : x
  2. Step 2: Convert to fraction form
    1,266.67/1,901.22 = 1,187.10/x
  3. Step 3: Cross multiply
    1,266.67x = 1,901.22 × 1,187.10
  4. Step 4: Simplify right side
    1,266.67x = 2,256,938.26
  5. Step 5: Solve for x
    x = 2,256,938.26/1,266.67
  6. Step 6: Final answer
    x = 1,781.79

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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.