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Finding the Fourth Proportional to 128,310.32, 192,399.76 and 68,372.95

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Solution

The fourth proportional to 128,310.32, 192,399.76 and 68,372.95 is: 102,524.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,310.32 : 192,399.76 = 68,372.95 : x
  2. Step 2: Convert to fraction form
    128,310.32/192,399.76 = 68,372.95/x
  3. Step 3: Cross multiply
    128,310.32x = 192,399.76 × 68,372.95
  4. Step 4: Simplify right side
    128,310.32x = 13,154,939,170.49
  5. Step 5: Solve for x
    x = 13,154,939,170.49/128,310.32
  6. Step 6: Final answer
    x = 102,524.40

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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.