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Finding the Fourth Proportional to 720.62, 994.36 and 425.78

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Solution

The fourth proportional to 720.62, 994.36 and 425.78 is: 587.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.62 : 994.36 = 425.78 : x
  2. Step 2: Convert to fraction form
    720.62/994.36 = 425.78/x
  3. Step 3: Cross multiply
    720.62x = 994.36 × 425.78
  4. Step 4: Simplify right side
    720.62x = 423,371.50
  5. Step 5: Solve for x
    x = 423,371.50/720.62
  6. Step 6: Final answer
    x = 587.51

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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.