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Finding the Fourth Proportional to 720.99, 1,081.31 and 234.18

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Solution

The fourth proportional to 720.99, 1,081.31 and 234.18 is: 351.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.99 : 1,081.31 = 234.18 : x
  2. Step 2: Convert to fraction form
    720.99/1,081.31 = 234.18/x
  3. Step 3: Cross multiply
    720.99x = 1,081.31 × 234.18
  4. Step 4: Simplify right side
    720.99x = 253,220.00
  5. Step 5: Solve for x
    x = 253,220.00/720.99
  6. Step 6: Final answer
    x = 351.21

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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.