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Finding the Fourth Proportional to 28,169.93, 38,874.95 and 15,422.90

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Solution

The fourth proportional to 28,169.93, 38,874.95 and 15,422.90 is: 21,283.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,169.93 : 38,874.95 = 15,422.90 : x
  2. Step 2: Convert to fraction form
    28,169.93/38,874.95 = 15,422.90/x
  3. Step 3: Cross multiply
    28,169.93x = 38,874.95 × 15,422.90
  4. Step 4: Simplify right side
    28,169.93x = 599,564,194.87
  5. Step 5: Solve for x
    x = 599,564,194.87/28,169.93
  6. Step 6: Final answer
    x = 21,283.84

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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.