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Finding the Fourth Proportional to 21,993.39, 30,354.94 and 12,561.95

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Solution

The fourth proportional to 21,993.39, 30,354.94 and 12,561.95 is: 17,337.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,993.39 : 30,354.94 = 12,561.95 : x
  2. Step 2: Convert to fraction form
    21,993.39/30,354.94 = 12,561.95/x
  3. Step 3: Cross multiply
    21,993.39x = 30,354.94 × 12,561.95
  4. Step 4: Simplify right side
    21,993.39x = 381,317,238.53
  5. Step 5: Solve for x
    x = 381,317,238.53/21,993.39
  6. Step 6: Final answer
    x = 17,337.81

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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.