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Finding the Fourth Proportional to 21,932.64, 30,265.20 and 12,499.20

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Solution

The fourth proportional to 21,932.64, 30,265.20 and 12,499.20 is: 17,247.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,932.64 : 30,265.20 = 12,499.20 : x
  2. Step 2: Convert to fraction form
    21,932.64/30,265.20 = 12,499.20/x
  3. Step 3: Cross multiply
    21,932.64x = 30,265.20 × 12,499.20
  4. Step 4: Simplify right side
    21,932.64x = 378,290,787.84
  5. Step 5: Solve for x
    x = 378,290,787.84/21,932.64
  6. Step 6: Final answer
    x = 17,247.85

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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.