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Finding the Fourth Proportional to 1,371.07, 1,891.42 and 839.77

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Solution

The fourth proportional to 1,371.07, 1,891.42 and 839.77 is: 1,158.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,371.07 : 1,891.42 = 839.77 : x
  2. Step 2: Convert to fraction form
    1,371.07/1,891.42 = 839.77/x
  3. Step 3: Cross multiply
    1,371.07x = 1,891.42 × 839.77
  4. Step 4: Simplify right side
    1,371.07x = 1,588,357.77
  5. Step 5: Solve for x
    x = 1,588,357.77/1,371.07
  6. Step 6: Final answer
    x = 1,158.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.