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Finding the Fourth Proportional to 1,332.63, 1,998.90 and 408.15

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Solution

The fourth proportional to 1,332.63, 1,998.90 and 408.15 is: 612.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.63 : 1,998.90 = 408.15 : x
  2. Step 2: Convert to fraction form
    1,332.63/1,998.90 = 408.15/x
  3. Step 3: Cross multiply
    1,332.63x = 1,998.90 × 408.15
  4. Step 4: Simplify right side
    1,332.63x = 815,851.04
  5. Step 5: Solve for x
    x = 815,851.04/1,332.63
  6. Step 6: Final answer
    x = 612.21

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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.