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Finding the Fourth Proportional to 207,138.20, 310,937.70 and 128,341.40

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Solution

The fourth proportional to 207,138.20, 310,937.70 and 128,341.40 is: 192,654.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,138.20 : 310,937.70 = 128,341.40 : x
  2. Step 2: Convert to fraction form
    207,138.20/310,937.70 = 128,341.40/x
  3. Step 3: Cross multiply
    207,138.20x = 310,937.70 × 128,341.40
  4. Step 4: Simplify right side
    207,138.20x = 39,906,179,730.78
  5. Step 5: Solve for x
    x = 39,906,179,730.78/207,138.20
  6. Step 6: Final answer
    x = 192,654.85

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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.