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Finding the Fourth Proportional to 20,801.78, 28,721.49 and 12,854.90

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Solution

The fourth proportional to 20,801.78, 28,721.49 and 12,854.90 is: 17,749.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,801.78 : 28,721.49 = 12,854.90 : x
  2. Step 2: Convert to fraction form
    20,801.78/28,721.49 = 12,854.90/x
  3. Step 3: Cross multiply
    20,801.78x = 28,721.49 × 12,854.90
  4. Step 4: Simplify right side
    20,801.78x = 369,211,881.80
  5. Step 5: Solve for x
    x = 369,211,881.80/20,801.78
  6. Step 6: Final answer
    x = 17,749.05

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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.