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Finding the Fourth Proportional to 138,455.60, 207,391.80 and 112,211.60

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Solution

The fourth proportional to 138,455.60, 207,391.80 and 112,211.60 is: 168,081.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,455.60 : 207,391.80 = 112,211.60 : x
  2. Step 2: Convert to fraction form
    138,455.60/207,391.80 = 112,211.60/x
  3. Step 3: Cross multiply
    138,455.60x = 207,391.80 × 112,211.60
  4. Step 4: Simplify right side
    138,455.60x = 23,271,765,704.88
  5. Step 5: Solve for x
    x = 23,271,765,704.88/138,455.60
  6. Step 6: Final answer
    x = 168,081.07

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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.