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Finding the Fourth Proportional to 18,901.87, 28,359.17 and 8,370.45

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Solution

The fourth proportional to 18,901.87, 28,359.17 and 8,370.45 is: 12,558.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,901.87 : 28,359.17 = 8,370.45 : x
  2. Step 2: Convert to fraction form
    18,901.87/28,359.17 = 8,370.45/x
  3. Step 3: Cross multiply
    18,901.87x = 28,359.17 × 8,370.45
  4. Step 4: Simplify right side
    18,901.87x = 237,379,014.53
  5. Step 5: Solve for x
    x = 237,379,014.53/18,901.87
  6. Step 6: Final answer
    x = 12,558.49

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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.