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Finding the Fourth Proportional to 20,993.52, 28,968.92 and 12,925.90

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Solution

The fourth proportional to 20,993.52, 28,968.92 and 12,925.90 is: 17,836.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,993.52 : 28,968.92 = 12,925.90 : x
  2. Step 2: Convert to fraction form
    20,993.52/28,968.92 = 12,925.90/x
  3. Step 3: Cross multiply
    20,993.52x = 28,968.92 × 12,925.90
  4. Step 4: Simplify right side
    20,993.52x = 374,449,258.29
  5. Step 5: Solve for x
    x = 374,449,258.29/20,993.52
  6. Step 6: Final answer
    x = 17,836.42

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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.