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Finding the Fourth Proportional to 2,218.81, 3,328.20 and 658.82

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Solution

The fourth proportional to 2,218.81, 3,328.20 and 658.82 is: 988.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,218.81 : 3,328.20 = 658.82 : x
  2. Step 2: Convert to fraction form
    2,218.81/3,328.20 = 658.82/x
  3. Step 3: Cross multiply
    2,218.81x = 3,328.20 × 658.82
  4. Step 4: Simplify right side
    2,218.81x = 2,192,664.79
  5. Step 5: Solve for x
    x = 2,192,664.79/2,218.81
  6. Step 6: Final answer
    x = 988.22

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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.