Home / 20,971.13-28,940.15-11,540.30

Finding the Fourth Proportional to 20,971.13, 28,940.15 and 11,540.30

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Solution

The fourth proportional to 20,971.13, 28,940.15 and 11,540.30 is: 15,925.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,971.13 : 28,940.15 = 11,540.30 : x
  2. Step 2: Convert to fraction form
    20,971.13/28,940.15 = 11,540.30/x
  3. Step 3: Cross multiply
    20,971.13x = 28,940.15 × 11,540.30
  4. Step 4: Simplify right side
    20,971.13x = 333,977,897.19
  5. Step 5: Solve for x
    x = 333,977,897.19/20,971.13
  6. Step 6: Final answer
    x = 15,925.61

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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.