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Finding the Fourth Proportional to 18,702.72, 28,073.52 and 8,321.76

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Solution

The fourth proportional to 18,702.72, 28,073.52 and 8,321.76 is: 12,491.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,702.72 : 28,073.52 = 8,321.76 : x
  2. Step 2: Convert to fraction form
    18,702.72/28,073.52 = 8,321.76/x
  3. Step 3: Cross multiply
    18,702.72x = 28,073.52 × 8,321.76
  4. Step 4: Simplify right side
    18,702.72x = 233,621,095.80
  5. Step 5: Solve for x
    x = 233,621,095.80/18,702.72
  6. Step 6: Final answer
    x = 12,491.29

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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.