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Finding the Fourth Proportional to 20,439, 28,205.82 and 11,486.34

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Solution

The fourth proportional to 20,439, 28,205.82 and 11,486.34 is: 15,851.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,439 : 28,205.82 = 11,486.34 : x
  2. Step 2: Convert to fraction form
    20,439/28,205.82 = 11,486.34/x
  3. Step 3: Cross multiply
    20,439x = 28,205.82 × 11,486.34
  4. Step 4: Simplify right side
    20,439x = 323,981,638.50
  5. Step 5: Solve for x
    x = 323,981,638.50/20,439
  6. Step 6: Final answer
    x = 15,851.15

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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.