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Finding the Fourth Proportional to 20,640.64, 30,939.95 and 8,143.51

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Solution

The fourth proportional to 20,640.64, 30,939.95 and 8,143.51 is: 12,206.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,640.64 : 30,939.95 = 8,143.51 : x
  2. Step 2: Convert to fraction form
    20,640.64/30,939.95 = 8,143.51/x
  3. Step 3: Cross multiply
    20,640.64x = 30,939.95 × 8,143.51
  4. Step 4: Simplify right side
    20,640.64x = 251,959,908.25
  5. Step 5: Solve for x
    x = 251,959,908.25/20,640.64
  6. Step 6: Final answer
    x = 12,206.98

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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.