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Finding the Fourth Proportional to 720.92, 1,081.70 and 336.18

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Solution

The fourth proportional to 720.92, 1,081.70 and 336.18 is: 504.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.92 : 1,081.70 = 336.18 : x
  2. Step 2: Convert to fraction form
    720.92/1,081.70 = 336.18/x
  3. Step 3: Cross multiply
    720.92x = 1,081.70 × 336.18
  4. Step 4: Simplify right side
    720.92x = 363,645.91
  5. Step 5: Solve for x
    x = 363,645.91/720.92
  6. Step 6: Final answer
    x = 504.42

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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.