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Finding the Fourth Proportional to 1,224.68, 1,689.42 and 782.12

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Solution

The fourth proportional to 1,224.68, 1,689.42 and 782.12 is: 1,078.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.68 : 1,689.42 = 782.12 : x
  2. Step 2: Convert to fraction form
    1,224.68/1,689.42 = 782.12/x
  3. Step 3: Cross multiply
    1,224.68x = 1,689.42 × 782.12
  4. Step 4: Simplify right side
    1,224.68x = 1,321,329.17
  5. Step 5: Solve for x
    x = 1,321,329.17/1,224.68
  6. Step 6: Final answer
    x = 1,078.92

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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.