Home / 1,939.75-2,909.80-553.05

Finding the Fourth Proportional to 1,939.75, 2,909.80 and 553.05

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Solution

The fourth proportional to 1,939.75, 2,909.80 and 553.05 is: 829.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.75 : 2,909.80 = 553.05 : x
  2. Step 2: Convert to fraction form
    1,939.75/2,909.80 = 553.05/x
  3. Step 3: Cross multiply
    1,939.75x = 2,909.80 × 553.05
  4. Step 4: Simplify right side
    1,939.75x = 1,609,274.42
  5. Step 5: Solve for x
    x = 1,609,274.42/1,939.75
  6. Step 6: Final answer
    x = 829.63

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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.