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Finding the Fourth Proportional to 1,371.68, 1,892.84 and 782.28

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Solution

The fourth proportional to 1,371.68, 1,892.84 and 782.28 is: 1,079.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,371.68 : 1,892.84 = 782.28 : x
  2. Step 2: Convert to fraction form
    1,371.68/1,892.84 = 782.28/x
  3. Step 3: Cross multiply
    1,371.68x = 1,892.84 × 782.28
  4. Step 4: Simplify right side
    1,371.68x = 1,480,730.88
  5. Step 5: Solve for x
    x = 1,480,730.88/1,371.68
  6. Step 6: Final answer
    x = 1,079.50

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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.