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Finding the Fourth Proportional to 720.81, 1,081.80 and 374.25

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Solution

The fourth proportional to 720.81, 1,081.80 and 374.25 is: 561.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.81 : 1,081.80 = 374.25 : x
  2. Step 2: Convert to fraction form
    720.81/1,081.80 = 374.25/x
  3. Step 3: Cross multiply
    720.81x = 1,081.80 × 374.25
  4. Step 4: Simplify right side
    720.81x = 404,863.65
  5. Step 5: Solve for x
    x = 404,863.65/720.81
  6. Step 6: Final answer
    x = 561.68

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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.