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Finding the Fourth Proportional to 207,424.20, 310,917.60 and 81,015.60

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Solution

The fourth proportional to 207,424.20, 310,917.60 and 81,015.60 is: 121,437.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,424.20 : 310,917.60 = 81,015.60 : x
  2. Step 2: Convert to fraction form
    207,424.20/310,917.60 = 81,015.60/x
  3. Step 3: Cross multiply
    207,424.20x = 310,917.60 × 81,015.60
  4. Step 4: Simplify right side
    207,424.20x = 25,189,175,914.56
  5. Step 5: Solve for x
    x = 25,189,175,914.56/207,424.20
  6. Step 6: Final answer
    x = 121,437.98

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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.