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Finding the Fourth Proportional to 720.38, 994.13 and 409.88

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Solution

The fourth proportional to 720.38, 994.13 and 409.88 is: 565.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.38 : 994.13 = 409.88 : x
  2. Step 2: Convert to fraction form
    720.38/994.13 = 409.88/x
  3. Step 3: Cross multiply
    720.38x = 994.13 × 409.88
  4. Step 4: Simplify right side
    720.38x = 407,466.98
  5. Step 5: Solve for x
    x = 407,466.98/720.38
  6. Step 6: Final answer
    x = 565.63

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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.