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Finding the Fourth Proportional to 18,422.40, 25,415.28 and 12,836.64

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Solution

The fourth proportional to 18,422.40, 25,415.28 and 12,836.64 is: 17,709.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,422.40 : 25,415.28 = 12,836.64 : x
  2. Step 2: Convert to fraction form
    18,422.40/25,415.28 = 12,836.64/x
  3. Step 3: Cross multiply
    18,422.40x = 25,415.28 × 12,836.64
  4. Step 4: Simplify right side
    18,422.40x = 326,246,799.86
  5. Step 5: Solve for x
    x = 326,246,799.86/18,422.40
  6. Step 6: Final answer
    x = 17,709.25

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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.