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Finding the Fourth Proportional to 217,540.80, 326,311.20 and 128,748.60

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Solution

The fourth proportional to 217,540.80, 326,311.20 and 128,748.60 is: 193,122.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    217,540.80 : 326,311.20 = 128,748.60 : x
  2. Step 2: Convert to fraction form
    217,540.80/326,311.20 = 128,748.60/x
  3. Step 3: Cross multiply
    217,540.80x = 326,311.20 × 128,748.60
  4. Step 4: Simplify right side
    217,540.80x = 42,012,110,164.32
  5. Step 5: Solve for x
    x = 42,012,110,164.32/217,540.80
  6. Step 6: Final answer
    x = 193,122.90

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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.