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Finding the Fourth Proportional to 18,989.32, 28,481.34 and 4,948.20

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Solution

The fourth proportional to 18,989.32, 28,481.34 and 4,948.20 is: 7,421.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.32 : 28,481.34 = 4,948.20 : x
  2. Step 2: Convert to fraction form
    18,989.32/28,481.34 = 4,948.20/x
  3. Step 3: Cross multiply
    18,989.32x = 28,481.34 × 4,948.20
  4. Step 4: Simplify right side
    18,989.32x = 140,931,491.95
  5. Step 5: Solve for x
    x = 140,931,491.95/18,989.32
  6. Step 6: Final answer
    x = 7,421.62

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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.