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Finding the Fourth Proportional to 21,891, 30,209.58 and 11,955

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Solution

The fourth proportional to 21,891, 30,209.58 and 11,955 is: 16,497.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,891 : 30,209.58 = 11,955 : x
  2. Step 2: Convert to fraction form
    21,891/30,209.58 = 11,955/x
  3. Step 3: Cross multiply
    21,891x = 30,209.58 × 11,955
  4. Step 4: Simplify right side
    21,891x = 361,155,528.90
  5. Step 5: Solve for x
    x = 361,155,528.90/21,891
  6. Step 6: Final answer
    x = 16,497.90

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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.