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Finding the Fourth Proportional to 1,939.91, 2,909.12 and 753.80

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Solution

The fourth proportional to 1,939.91, 2,909.12 and 753.80 is: 1,130.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.91 : 2,909.12 = 753.80 : x
  2. Step 2: Convert to fraction form
    1,939.91/2,909.12 = 753.80/x
  3. Step 3: Cross multiply
    1,939.91x = 2,909.12 × 753.80
  4. Step 4: Simplify right side
    1,939.91x = 2,192,876.34
  5. Step 5: Solve for x
    x = 2,192,876.34/1,939.91
  6. Step 6: Final answer
    x = 1,130.40

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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.