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Finding the Fourth Proportional to 720.63, 1,081.61 and 330.84

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Solution

The fourth proportional to 720.63, 1,081.61 and 330.84 is: 496.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.63 : 1,081.61 = 330.84 : x
  2. Step 2: Convert to fraction form
    720.63/1,081.61 = 330.84/x
  3. Step 3: Cross multiply
    720.63x = 1,081.61 × 330.84
  4. Step 4: Simplify right side
    720.63x = 357,839.85
  5. Step 5: Solve for x
    x = 357,839.85/720.63
  6. Step 6: Final answer
    x = 496.57

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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.