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Finding the Fourth Proportional to 720.88, 994.86 and 406.15

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Solution

The fourth proportional to 720.88, 994.86 and 406.15 is: 560.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.88 : 994.86 = 406.15 : x
  2. Step 2: Convert to fraction form
    720.88/994.86 = 406.15/x
  3. Step 3: Cross multiply
    720.88x = 994.86 × 406.15
  4. Step 4: Simplify right side
    720.88x = 404,055.38
  5. Step 5: Solve for x
    x = 404,055.38/720.88
  6. Step 6: Final answer
    x = 560.50

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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.