Home / 20,814.90-28,721.34-11,862.78

Finding the Fourth Proportional to 20,814.90, 28,721.34 and 11,862.78

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Solution

The fourth proportional to 20,814.90, 28,721.34 and 11,862.78 is: 16,368.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,814.90 : 28,721.34 = 11,862.78 : x
  2. Step 2: Convert to fraction form
    20,814.90/28,721.34 = 11,862.78/x
  3. Step 3: Cross multiply
    20,814.90x = 28,721.34 × 11,862.78
  4. Step 4: Simplify right side
    20,814.90x = 340,714,937.73
  5. Step 5: Solve for x
    x = 340,714,937.73/20,814.90
  6. Step 6: Final answer
    x = 16,368.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.