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Finding the Fourth Proportional to 230,619.78, 318,243.15 and 128,655.90

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Solution

The fourth proportional to 230,619.78, 318,243.15 and 128,655.90 is: 177,538.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    230,619.78 : 318,243.15 = 128,655.90 : x
  2. Step 2: Convert to fraction form
    230,619.78/318,243.15 = 128,655.90/x
  3. Step 3: Cross multiply
    230,619.78x = 318,243.15 × 128,655.90
  4. Step 4: Simplify right side
    230,619.78x = 40,943,858,882.09
  5. Step 5: Solve for x
    x = 40,943,858,882.09/230,619.78
  6. Step 6: Final answer
    x = 177,538.37

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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.