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Finding the Fourth Proportional to 720.87, 994.81 and 406.14

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Solution

The fourth proportional to 720.87, 994.81 and 406.14 is: 560.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.87 : 994.81 = 406.14 : x
  2. Step 2: Convert to fraction form
    720.87/994.81 = 406.14/x
  3. Step 3: Cross multiply
    720.87x = 994.81 × 406.14
  4. Step 4: Simplify right side
    720.87x = 404,033.61
  5. Step 5: Solve for x
    x = 404,033.61/720.87
  6. Step 6: Final answer
    x = 560.48

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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.