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Finding the Fourth Proportional to 18,264.88, 27,360.64 and 8,390.40

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Solution

The fourth proportional to 18,264.88, 27,360.64 and 8,390.40 is: 12,568.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,264.88 : 27,360.64 = 8,390.40 : x
  2. Step 2: Convert to fraction form
    18,264.88/27,360.64 = 8,390.40/x
  3. Step 3: Cross multiply
    18,264.88x = 27,360.64 × 8,390.40
  4. Step 4: Simplify right side
    18,264.88x = 229,566,713.86
  5. Step 5: Solve for x
    x = 229,566,713.86/18,264.88
  6. Step 6: Final answer
    x = 12,568.75

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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.