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Finding the Fourth Proportional to 21,991.82, 30,348 and 12,560.40

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Solution

The fourth proportional to 21,991.82, 30,348 and 12,560.40 is: 17,332.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,991.82 : 30,348 = 12,560.40 : x
  2. Step 2: Convert to fraction form
    21,991.82/30,348 = 12,560.40/x
  3. Step 3: Cross multiply
    21,991.82x = 30,348 × 12,560.40
  4. Step 4: Simplify right side
    21,991.82x = 381,183,019.20
  5. Step 5: Solve for x
    x = 381,183,019.20/21,991.82
  6. Step 6: Final answer
    x = 17,332.95

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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.