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Finding the Fourth Proportional to 21,758.92, 30,020.06 and 15,042.12

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Solution

The fourth proportional to 21,758.92, 30,020.06 and 15,042.12 is: 20,753.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,758.92 : 30,020.06 = 15,042.12 : x
  2. Step 2: Convert to fraction form
    21,758.92/30,020.06 = 15,042.12/x
  3. Step 3: Cross multiply
    21,758.92x = 30,020.06 × 15,042.12
  4. Step 4: Simplify right side
    21,758.92x = 451,565,344.93
  5. Step 5: Solve for x
    x = 451,565,344.93/21,758.92
  6. Step 6: Final answer
    x = 20,753.11

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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.