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Finding the Fourth Proportional to 720.22, 993.63 and 425.38

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Solution

The fourth proportional to 720.22, 993.63 and 425.38 is: 586.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.22 : 993.63 = 425.38 : x
  2. Step 2: Convert to fraction form
    720.22/993.63 = 425.38/x
  3. Step 3: Cross multiply
    720.22x = 993.63 × 425.38
  4. Step 4: Simplify right side
    720.22x = 422,670.33
  5. Step 5: Solve for x
    x = 422,670.33/720.22
  6. Step 6: Final answer
    x = 586.86

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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.