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Finding the Fourth Proportional to 720.97, 1,081.80 and 374.24

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Solution

The fourth proportional to 720.97, 1,081.80 and 374.24 is: 561.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.97 : 1,081.80 = 374.24 : x
  2. Step 2: Convert to fraction form
    720.97/1,081.80 = 374.24/x
  3. Step 3: Cross multiply
    720.97x = 1,081.80 × 374.24
  4. Step 4: Simplify right side
    720.97x = 404,855.54
  5. Step 5: Solve for x
    x = 404,855.54/720.97
  6. Step 6: Final answer
    x = 561.54

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.