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Finding the Fourth Proportional to 123,879.36, 170,978.40 and 73,568.64

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Solution

The fourth proportional to 123,879.36, 170,978.40 and 73,568.64 is: 101,539.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    123,879.36 : 170,978.40 = 73,568.64 : x
  2. Step 2: Convert to fraction form
    123,879.36/170,978.40 = 73,568.64/x
  3. Step 3: Cross multiply
    123,879.36x = 170,978.40 × 73,568.64
  4. Step 4: Simplify right side
    123,879.36x = 12,578,648,357.38
  5. Step 5: Solve for x
    x = 12,578,648,357.38/123,879.36
  6. Step 6: Final answer
    x = 101,539.50

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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.