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Finding the Fourth Proportional to 20,648.78, 28,494.15 and 11,698.49

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Solution

The fourth proportional to 20,648.78, 28,494.15 and 11,698.49 is: 16,143.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,648.78 : 28,494.15 = 11,698.49 : x
  2. Step 2: Convert to fraction form
    20,648.78/28,494.15 = 11,698.49/x
  3. Step 3: Cross multiply
    20,648.78x = 28,494.15 × 11,698.49
  4. Step 4: Simplify right side
    20,648.78x = 333,338,528.83
  5. Step 5: Solve for x
    x = 333,338,528.83/20,648.78
  6. Step 6: Final answer
    x = 16,143.26

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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.