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Finding the Fourth Proportional to 21,754.56, 30,020.78 and 12,679.32

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Solution

The fourth proportional to 21,754.56, 30,020.78 and 12,679.32 is: 17,497.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,754.56 : 30,020.78 = 12,679.32 : x
  2. Step 2: Convert to fraction form
    21,754.56/30,020.78 = 12,679.32/x
  3. Step 3: Cross multiply
    21,754.56x = 30,020.78 × 12,679.32
  4. Step 4: Simplify right side
    21,754.56x = 380,643,076.27
  5. Step 5: Solve for x
    x = 380,643,076.27/21,754.56
  6. Step 6: Final answer
    x = 17,497.16

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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.