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Finding the Fourth Proportional to 720.65, 1,081.07 and 355.44

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Solution

The fourth proportional to 720.65, 1,081.07 and 355.44 is: 533.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    720.65 : 1,081.07 = 355.44 : x
  2. Step 2: Convert to fraction form
    720.65/1,081.07 = 355.44/x
  3. Step 3: Cross multiply
    720.65x = 1,081.07 × 355.44
  4. Step 4: Simplify right side
    720.65x = 384,253.74
  5. Step 5: Solve for x
    x = 384,253.74/720.65
  6. Step 6: Final answer
    x = 533.21

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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.