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Finding the Fourth Proportional to 1,332.57, 1,998.92 and 408.06

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Solution

The fourth proportional to 1,332.57, 1,998.92 and 408.06 is: 612.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.57 : 1,998.92 = 408.06 : x
  2. Step 2: Convert to fraction form
    1,332.57/1,998.92 = 408.06/x
  3. Step 3: Cross multiply
    1,332.57x = 1,998.92 × 408.06
  4. Step 4: Simplify right side
    1,332.57x = 815,677.25
  5. Step 5: Solve for x
    x = 815,677.25/1,332.57
  6. Step 6: Final answer
    x = 612.11

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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.