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Finding the Fourth Proportional to 18,984.60, 28,479.86 and 9,122.04

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Solution

The fourth proportional to 18,984.60, 28,479.86 and 9,122.04 is: 13,684.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,984.60 : 28,479.86 = 9,122.04 : x
  2. Step 2: Convert to fraction form
    18,984.60/28,479.86 = 9,122.04/x
  3. Step 3: Cross multiply
    18,984.60x = 28,479.86 × 9,122.04
  4. Step 4: Simplify right side
    18,984.60x = 259,794,422.11
  5. Step 5: Solve for x
    x = 259,794,422.11/18,984.60
  6. Step 6: Final answer
    x = 13,684.48

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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.