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Finding the Fourth Proportional to 1,224.06, 1,689.76 and 782.56

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Solution

The fourth proportional to 1,224.06, 1,689.76 and 782.56 is: 1,080.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,224.06 : 1,689.76 = 782.56 : x
  2. Step 2: Convert to fraction form
    1,224.06/1,689.76 = 782.56/x
  3. Step 3: Cross multiply
    1,224.06x = 1,689.76 × 782.56
  4. Step 4: Simplify right side
    1,224.06x = 1,322,341.68
  5. Step 5: Solve for x
    x = 1,322,341.68/1,224.06
  6. Step 6: Final answer
    x = 1,080.29

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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.