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Finding the Fourth Proportional to 781.82, 1,078.94 and 450.35

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Solution

The fourth proportional to 781.82, 1,078.94 and 450.35 is: 621.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.82 : 1,078.94 = 450.35 : x
  2. Step 2: Convert to fraction form
    781.82/1,078.94 = 450.35/x
  3. Step 3: Cross multiply
    781.82x = 1,078.94 × 450.35
  4. Step 4: Simplify right side
    781.82x = 485,892.98
  5. Step 5: Solve for x
    x = 485,892.98/781.82
  6. Step 6: Final answer
    x = 621.49

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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.