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Finding the Fourth Proportional to 102,874.60, 154,311.90 and 85,378.60

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Solution

The fourth proportional to 102,874.60, 154,311.90 and 85,378.60 is: 128,067.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,874.60 : 154,311.90 = 85,378.60 : x
  2. Step 2: Convert to fraction form
    102,874.60/154,311.90 = 85,378.60/x
  3. Step 3: Cross multiply
    102,874.60x = 154,311.90 × 85,378.60
  4. Step 4: Simplify right side
    102,874.60x = 13,174,933,985.34
  5. Step 5: Solve for x
    x = 13,174,933,985.34/102,874.60
  6. Step 6: Final answer
    x = 128,067.90

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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.