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Finding the Fourth Proportional to 28,363.88, 39,139.80 and 15,789.44

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Solution

The fourth proportional to 28,363.88, 39,139.80 and 15,789.44 is: 21,788.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,363.88 : 39,139.80 = 15,789.44 : x
  2. Step 2: Convert to fraction form
    28,363.88/39,139.80 = 15,789.44/x
  3. Step 3: Cross multiply
    28,363.88x = 39,139.80 × 15,789.44
  4. Step 4: Simplify right side
    28,363.88x = 617,995,523.71
  5. Step 5: Solve for x
    x = 617,995,523.71/28,363.88
  6. Step 6: Final answer
    x = 21,788.12

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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.