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Finding the Fourth Proportional to 18,989.69, 28,481.90 and 4,948.58

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Solution

The fourth proportional to 18,989.69, 28,481.90 and 4,948.58 is: 7,422.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.69 : 28,481.90 = 4,948.58 : x
  2. Step 2: Convert to fraction form
    18,989.69/28,481.90 = 4,948.58/x
  3. Step 3: Cross multiply
    18,989.69x = 28,481.90 × 4,948.58
  4. Step 4: Simplify right side
    18,989.69x = 140,945,044.28
  5. Step 5: Solve for x
    x = 140,945,044.28/18,989.69
  6. Step 6: Final answer
    x = 7,422.19

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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.