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Finding the Fourth Proportional to 781.11, 1,078.56 and 625.05

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Solution

The fourth proportional to 781.11, 1,078.56 and 625.05 is: 863.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.11 : 1,078.56 = 625.05 : x
  2. Step 2: Convert to fraction form
    781.11/1,078.56 = 625.05/x
  3. Step 3: Cross multiply
    781.11x = 1,078.56 × 625.05
  4. Step 4: Simplify right side
    781.11x = 674,153.93
  5. Step 5: Solve for x
    x = 674,153.93/781.11
  6. Step 6: Final answer
    x = 863.07

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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.