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Finding the Fourth Proportional to 1,330.97, 1,995.79 and 406.31

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Solution

The fourth proportional to 1,330.97, 1,995.79 and 406.31 is: 609.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,330.97 : 1,995.79 = 406.31 : x
  2. Step 2: Convert to fraction form
    1,330.97/1,995.79 = 406.31/x
  3. Step 3: Cross multiply
    1,330.97x = 1,995.79 × 406.31
  4. Step 4: Simplify right side
    1,330.97x = 810,909.43
  5. Step 5: Solve for x
    x = 810,909.43/1,330.97
  6. Step 6: Final answer
    x = 609.26

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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.