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Finding the Fourth Proportional to 207,999.78, 311,387.31 and 128,859.54

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Solution

The fourth proportional to 207,999.78, 311,387.31 and 128,859.54 is: 192,909.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,999.78 : 311,387.31 = 128,859.54 : x
  2. Step 2: Convert to fraction form
    207,999.78/311,387.31 = 128,859.54/x
  3. Step 3: Cross multiply
    207,999.78x = 311,387.31 × 128,859.54
  4. Step 4: Simplify right side
    207,999.78x = 40,125,225,528.44
  5. Step 5: Solve for x
    x = 40,125,225,528.44/207,999.78
  6. Step 6: Final answer
    x = 192,909.94

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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.