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Finding the Fourth Proportional to 100,359.83, 138,499.62 and 55,039.70

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Solution

The fourth proportional to 100,359.83, 138,499.62 and 55,039.70 is: 75,956.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,359.83 : 138,499.62 = 55,039.70 : x
  2. Step 2: Convert to fraction form
    100,359.83/138,499.62 = 55,039.70/x
  3. Step 3: Cross multiply
    100,359.83x = 138,499.62 × 55,039.70
  4. Step 4: Simplify right side
    100,359.83x = 7,622,977,534.91
  5. Step 5: Solve for x
    x = 7,622,977,534.91/100,359.83
  6. Step 6: Final answer
    x = 75,956.46

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.