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Finding the Fourth Proportional to 138,110.80, 207,319.80 and 85,579.60

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Solution

The fourth proportional to 138,110.80, 207,319.80 and 85,579.60 is: 128,464.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,110.80 : 207,319.80 = 85,579.60 : x
  2. Step 2: Convert to fraction form
    138,110.80/207,319.80 = 85,579.60/x
  3. Step 3: Cross multiply
    138,110.80x = 207,319.80 × 85,579.60
  4. Step 4: Simplify right side
    138,110.80x = 17,742,345,556.08
  5. Step 5: Solve for x
    x = 17,742,345,556.08/138,110.80
  6. Step 6: Final answer
    x = 128,464.58

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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.