Home / 1,939.90-2,909.41-553.21

Finding the Fourth Proportional to 1,939.90, 2,909.41 and 553.21

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Solution

The fourth proportional to 1,939.90, 2,909.41 and 553.21 is: 829.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,939.90 : 2,909.41 = 553.21 : x
  2. Step 2: Convert to fraction form
    1,939.90/2,909.41 = 553.21/x
  3. Step 3: Cross multiply
    1,939.90x = 2,909.41 × 553.21
  4. Step 4: Simplify right side
    1,939.90x = 1,609,514.71
  5. Step 5: Solve for x
    x = 1,609,514.71/1,939.90
  6. Step 6: Final answer
    x = 829.69

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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.