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Finding the Fourth Proportional to 21,892.95, 30,206.70 and 13,391.97

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Solution

The fourth proportional to 21,892.95, 30,206.70 and 13,391.97 is: 18,477.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,892.95 : 30,206.70 = 13,391.97 : x
  2. Step 2: Convert to fraction form
    21,892.95/30,206.70 = 13,391.97/x
  3. Step 3: Cross multiply
    21,892.95x = 30,206.70 × 13,391.97
  4. Step 4: Simplify right side
    21,892.95x = 404,527,220.20
  5. Step 5: Solve for x
    x = 404,527,220.20/21,892.95
  6. Step 6: Final answer
    x = 18,477.51

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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.