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Finding the Fourth Proportional to 1,901.36, 2,849.60 and 861.32

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Solution

The fourth proportional to 1,901.36, 2,849.60 and 861.32 is: 1,290.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,901.36 : 2,849.60 = 861.32 : x
  2. Step 2: Convert to fraction form
    1,901.36/2,849.60 = 861.32/x
  3. Step 3: Cross multiply
    1,901.36x = 2,849.60 × 861.32
  4. Step 4: Simplify right side
    1,901.36x = 2,454,417.47
  5. Step 5: Solve for x
    x = 2,454,417.47/1,901.36
  6. Step 6: Final answer
    x = 1,290.87

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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.