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Finding the Fourth Proportional to 781.34, 1,078.02 and 445.25

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Solution

The fourth proportional to 781.34, 1,078.02 and 445.25 is: 614.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    781.34 : 1,078.02 = 445.25 : x
  2. Step 2: Convert to fraction form
    781.34/1,078.02 = 445.25/x
  3. Step 3: Cross multiply
    781.34x = 1,078.02 × 445.25
  4. Step 4: Simplify right side
    781.34x = 479,983.01
  5. Step 5: Solve for x
    x = 479,983.01/781.34
  6. Step 6: Final answer
    x = 614.31

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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.