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Finding the Fourth Proportional to 28,143.52, 38,836.59 and 15,394.21

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Solution

The fourth proportional to 28,143.52, 38,836.59 and 15,394.21 is: 21,243.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,143.52 : 38,836.59 = 15,394.21 : x
  2. Step 2: Convert to fraction form
    28,143.52/38,836.59 = 15,394.21/x
  3. Step 3: Cross multiply
    28,143.52x = 38,836.59 × 15,394.21
  4. Step 4: Simplify right side
    28,143.52x = 597,858,622.14
  5. Step 5: Solve for x
    x = 597,858,622.14/28,143.52
  6. Step 6: Final answer
    x = 21,243.21

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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.