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Finding the Fourth Proportional to 207,398.20, 311,327.70 and 128,601.40

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Solution

The fourth proportional to 207,398.20, 311,327.70 and 128,601.40 is: 193,044.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,398.20 : 311,327.70 = 128,601.40 : x
  2. Step 2: Convert to fraction form
    207,398.20/311,327.70 = 128,601.40/x
  3. Step 3: Cross multiply
    207,398.20x = 311,327.70 × 128,601.40
  4. Step 4: Simplify right side
    207,398.20x = 40,037,178,078.78
  5. Step 5: Solve for x
    x = 40,037,178,078.78/207,398.20
  6. Step 6: Final answer
    x = 193,044.96

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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.