Home / 20,939.31-28,896.80-11,508.12

Finding the Fourth Proportional to 20,939.31, 28,896.80 and 11,508.12

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Solution

The fourth proportional to 20,939.31, 28,896.80 and 11,508.12 is: 15,881.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,939.31 : 28,896.80 = 11,508.12 : x
  2. Step 2: Convert to fraction form
    20,939.31/28,896.80 = 11,508.12/x
  3. Step 3: Cross multiply
    20,939.31x = 28,896.80 × 11,508.12
  4. Step 4: Simplify right side
    20,939.31x = 332,547,784.48
  5. Step 5: Solve for x
    x = 332,547,784.48/20,939.31
  6. Step 6: Final answer
    x = 15,881.51

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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.