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Finding the Fourth Proportional to 18,988.90, 28,480.84 and 4,949.95

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Solution

The fourth proportional to 18,988.90, 28,480.84 and 4,949.95 is: 7,424.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,988.90 : 28,480.84 = 4,949.95 : x
  2. Step 2: Convert to fraction form
    18,988.90/28,480.84 = 4,949.95/x
  3. Step 3: Cross multiply
    18,988.90x = 28,480.84 × 4,949.95
  4. Step 4: Simplify right side
    18,988.90x = 140,978,733.96
  5. Step 5: Solve for x
    x = 140,978,733.96/18,988.90
  6. Step 6: Final answer
    x = 7,424.27

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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.