Home / 1,079.90-1,619.09-421.27

Finding the Fourth Proportional to 1,079.90, 1,619.09 and 421.27

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Solution

The fourth proportional to 1,079.90, 1,619.09 and 421.27 is: 631.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,079.90 : 1,619.09 = 421.27 : x
  2. Step 2: Convert to fraction form
    1,079.90/1,619.09 = 421.27/x
  3. Step 3: Cross multiply
    1,079.90x = 1,619.09 × 421.27
  4. Step 4: Simplify right side
    1,079.90x = 682,069.47
  5. Step 5: Solve for x
    x = 682,069.47/1,079.90
  6. Step 6: Final answer
    x = 631.61

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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.