Home / 20,805.90-28,712.10-11,374.46

Finding the Fourth Proportional to 20,805.90, 28,712.10 and 11,374.46

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Solution

The fourth proportional to 20,805.90, 28,712.10 and 11,374.46 is: 15,696.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,805.90 : 28,712.10 = 11,374.46 : x
  2. Step 2: Convert to fraction form
    20,805.90/28,712.10 = 11,374.46/x
  3. Step 3: Cross multiply
    20,805.90x = 28,712.10 × 11,374.46
  4. Step 4: Simplify right side
    20,805.90x = 326,584,632.97
  5. Step 5: Solve for x
    x = 326,584,632.97/20,805.90
  6. Step 6: Final answer
    x = 15,696.73

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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.