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Finding the Fourth Proportional to 724.83, 1,087.21 and 211.83

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Solution

The fourth proportional to 724.83, 1,087.21 and 211.83 is: 317.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    724.83 : 1,087.21 = 211.83 : x
  2. Step 2: Convert to fraction form
    724.83/1,087.21 = 211.83/x
  3. Step 3: Cross multiply
    724.83x = 1,087.21 × 211.83
  4. Step 4: Simplify right side
    724.83x = 230,303.69
  5. Step 5: Solve for x
    x = 230,303.69/724.83
  6. Step 6: Final answer
    x = 317.73

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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.