Home / 20,815.89-28,726.34-11,385.06

Finding the Fourth Proportional to 20,815.89, 28,726.34 and 11,385.06

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Solution

The fourth proportional to 20,815.89, 28,726.34 and 11,385.06 is: 15,711.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.89 : 28,726.34 = 11,385.06 : x
  2. Step 2: Convert to fraction form
    20,815.89/28,726.34 = 11,385.06/x
  3. Step 3: Cross multiply
    20,815.89x = 28,726.34 × 11,385.06
  4. Step 4: Simplify right side
    20,815.89x = 327,051,104.48
  5. Step 5: Solve for x
    x = 327,051,104.48/20,815.89
  6. Step 6: Final answer
    x = 15,711.61

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1.5x scale

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.