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Finding the Fourth Proportional to 781.92, 1,078.94 and 445.80

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Solution

The fourth proportional to 781.92, 1,078.94 and 445.80 is: 615.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.92 : 1,078.94 = 445.80 : x
  2. Step 2: Convert to fraction form
    781.92/1,078.94 = 445.80/x
  3. Step 3: Cross multiply
    781.92x = 1,078.94 × 445.80
  4. Step 4: Simplify right side
    781.92x = 480,991.45
  5. Step 5: Solve for x
    x = 480,991.45/781.92
  6. Step 6: Final answer
    x = 615.14

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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.