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Finding the Fourth Proportional to 206,866.70, 310,300.05 and 128,134.70

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Solution

The fourth proportional to 206,866.70, 310,300.05 and 128,134.70 is: 192,202.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,866.70 : 310,300.05 = 128,134.70 : x
  2. Step 2: Convert to fraction form
    206,866.70/310,300.05 = 128,134.70/x
  3. Step 3: Cross multiply
    206,866.70x = 310,300.05 × 128,134.70
  4. Step 4: Simplify right side
    206,866.70x = 39,760,203,816.74
  5. Step 5: Solve for x
    x = 39,760,203,816.74/206,866.70
  6. Step 6: Final answer
    x = 192,202.05

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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.