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Finding the Fourth Proportional to 18,955.34, 28,433.12 and 8,422.88

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Solution

The fourth proportional to 18,955.34, 28,433.12 and 8,422.88 is: 12,634.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,955.34 : 28,433.12 = 8,422.88 : x
  2. Step 2: Convert to fraction form
    18,955.34/28,433.12 = 8,422.88/x
  3. Step 3: Cross multiply
    18,955.34x = 28,433.12 × 8,422.88
  4. Step 4: Simplify right side
    18,955.34x = 239,488,573.51
  5. Step 5: Solve for x
    x = 239,488,573.51/18,955.34
  6. Step 6: Final answer
    x = 12,634.36

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.