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Finding the Fourth Proportional to 20,640.52, 30,960.70 and 8,328.52

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Solution

The fourth proportional to 20,640.52, 30,960.70 and 8,328.52 is: 12,492.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.52 : 30,960.70 = 8,328.52 : x
  2. Step 2: Convert to fraction form
    20,640.52/30,960.70 = 8,328.52/x
  3. Step 3: Cross multiply
    20,640.52x = 30,960.70 × 8,328.52
  4. Step 4: Simplify right side
    20,640.52x = 257,856,809.16
  5. Step 5: Solve for x
    x = 257,856,809.16/20,640.52
  6. Step 6: Final answer
    x = 12,492.75

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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.