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Finding the Fourth Proportional to 21,791.70, 30,074.58 and 12,841.98

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Solution

The fourth proportional to 21,791.70, 30,074.58 and 12,841.98 is: 17,723.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,791.70 : 30,074.58 = 12,841.98 : x
  2. Step 2: Convert to fraction form
    21,791.70/30,074.58 = 12,841.98/x
  3. Step 3: Cross multiply
    21,791.70x = 30,074.58 × 12,841.98
  4. Step 4: Simplify right side
    21,791.70x = 386,217,154.87
  5. Step 5: Solve for x
    x = 386,217,154.87/21,791.70
  6. Step 6: Final answer
    x = 17,723.13

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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.