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Finding the Fourth Proportional to 100,453.50, 138,632.31 and 55,741.50

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Solution

The fourth proportional to 100,453.50, 138,632.31 and 55,741.50 is: 76,926.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    100,453.50 : 138,632.31 = 55,741.50 : x
  2. Step 2: Convert to fraction form
    100,453.50/138,632.31 = 55,741.50/x
  3. Step 3: Cross multiply
    100,453.50x = 138,632.31 × 55,741.50
  4. Step 4: Simplify right side
    100,453.50x = 7,727,572,907.87
  5. Step 5: Solve for x
    x = 7,727,572,907.87/100,453.50
  6. Step 6: Final answer
    x = 76,926.87

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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.