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Finding the Fourth Proportional to 1,332.66, 1,999.29 and 408.21

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Solution

The fourth proportional to 1,332.66, 1,999.29 and 408.21 is: 612.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,332.66 : 1,999.29 = 408.21 : x
  2. Step 2: Convert to fraction form
    1,332.66/1,999.29 = 408.21/x
  3. Step 3: Cross multiply
    1,332.66x = 1,999.29 × 408.21
  4. Step 4: Simplify right side
    1,332.66x = 816,130.17
  5. Step 5: Solve for x
    x = 816,130.17/1,332.66
  6. Step 6: Final answer
    x = 612.41

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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.