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Finding the Fourth Proportional to 1,939.38, 2,909.07 and 571.38

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Solution

The fourth proportional to 1,939.38, 2,909.07 and 571.38 is: 857.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.38 : 2,909.07 = 571.38 : x
  2. Step 2: Convert to fraction form
    1,939.38/2,909.07 = 571.38/x
  3. Step 3: Cross multiply
    1,939.38x = 2,909.07 × 571.38
  4. Step 4: Simplify right side
    1,939.38x = 1,662,167.01
  5. Step 5: Solve for x
    x = 1,662,167.01/1,939.38
  6. Step 6: Final answer
    x = 857.06

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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.