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Finding the Fourth Proportional to 1,329.97, 1,995.20 and 405.43

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Solution

The fourth proportional to 1,329.97, 1,995.20 and 405.43 is: 608.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,329.97 : 1,995.20 = 405.43 : x
  2. Step 2: Convert to fraction form
    1,329.97/1,995.20 = 405.43/x
  3. Step 3: Cross multiply
    1,329.97x = 1,995.20 × 405.43
  4. Step 4: Simplify right side
    1,329.97x = 808,913.94
  5. Step 5: Solve for x
    x = 808,913.94/1,329.97
  6. Step 6: Final answer
    x = 608.22

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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.