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Finding the Fourth Proportional to 20,994.73, 28,974.77 and 15,680.32

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Solution

The fourth proportional to 20,994.73, 28,974.77 and 15,680.32 is: 21,640.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,994.73 : 28,974.77 = 15,680.32 : x
  2. Step 2: Convert to fraction form
    20,994.73/28,974.77 = 15,680.32/x
  3. Step 3: Cross multiply
    20,994.73x = 28,974.77 × 15,680.32
  4. Step 4: Simplify right side
    20,994.73x = 454,333,442.25
  5. Step 5: Solve for x
    x = 454,333,442.25/20,994.73
  6. Step 6: Final answer
    x = 21,640.36

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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.