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Finding the Fourth Proportional to 28,142.52, 38,835.21 and 15,393.21

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Solution

The fourth proportional to 28,142.52, 38,835.21 and 15,393.21 is: 21,241.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,142.52 : 38,835.21 = 15,393.21 : x
  2. Step 2: Convert to fraction form
    28,142.52/38,835.21 = 15,393.21/x
  3. Step 3: Cross multiply
    28,142.52x = 38,835.21 × 15,393.21
  4. Step 4: Simplify right side
    28,142.52x = 597,798,542.92
  5. Step 5: Solve for x
    x = 597,798,542.92/28,142.52
  6. Step 6: Final answer
    x = 21,241.83

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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.