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Finding the Fourth Proportional to 720.75, 994.69 and 401.74

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Solution

The fourth proportional to 720.75, 994.69 and 401.74 is: 554.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.75 : 994.69 = 401.74 : x
  2. Step 2: Convert to fraction form
    720.75/994.69 = 401.74/x
  3. Step 3: Cross multiply
    720.75x = 994.69 × 401.74
  4. Step 4: Simplify right side
    720.75x = 399,610.99
  5. Step 5: Solve for x
    x = 399,610.99/720.75
  6. Step 6: Final answer
    x = 554.43

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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.