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Finding the Fourth Proportional to 762.84, 1,138.43 and 680.82

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Solution

The fourth proportional to 762.84, 1,138.43 and 680.82 is: 1,016.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    762.84 : 1,138.43 = 680.82 : x
  2. Step 2: Convert to fraction form
    762.84/1,138.43 = 680.82/x
  3. Step 3: Cross multiply
    762.84x = 1,138.43 × 680.82
  4. Step 4: Simplify right side
    762.84x = 775,062.51
  5. Step 5: Solve for x
    x = 775,062.51/762.84
  6. Step 6: Final answer
    x = 1,016.02

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.