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Finding the Fourth Proportional to 1,371.36, 1,892.43 and 782.09

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Solution

The fourth proportional to 1,371.36, 1,892.43 and 782.09 is: 1,079.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,371.36 : 1,892.43 = 782.09 : x
  2. Step 2: Convert to fraction form
    1,371.36/1,892.43 = 782.09/x
  3. Step 3: Cross multiply
    1,371.36x = 1,892.43 × 782.09
  4. Step 4: Simplify right side
    1,371.36x = 1,480,041.12
  5. Step 5: Solve for x
    x = 1,480,041.12/1,371.36
  6. Step 6: Final answer
    x = 1,079.25

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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.