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Finding the Fourth Proportional to 207,318.11, 310,780.13 and 81,039.31

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Solution

The fourth proportional to 207,318.11, 310,780.13 and 81,039.31 is: 121,481.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,318.11 : 310,780.13 = 81,039.31 : x
  2. Step 2: Convert to fraction form
    207,318.11/310,780.13 = 81,039.31/x
  3. Step 3: Cross multiply
    207,318.11x = 310,780.13 × 81,039.31
  4. Step 4: Simplify right side
    207,318.11x = 25,185,406,114.76
  5. Step 5: Solve for x
    x = 25,185,406,114.76/207,318.11
  6. Step 6: Final answer
    x = 121,481.94

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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.