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Finding the Fourth Proportional to 128,478.38, 192,793.50 and 71,599.77

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Solution

The fourth proportional to 128,478.38, 192,793.50 and 71,599.77 is: 107,441.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,478.38 : 192,793.50 = 71,599.77 : x
  2. Step 2: Convert to fraction form
    128,478.38/192,793.50 = 71,599.77/x
  3. Step 3: Cross multiply
    128,478.38x = 192,793.50 × 71,599.77
  4. Step 4: Simplify right side
    128,478.38x = 13,803,970,257.50
  5. Step 5: Solve for x
    x = 13,803,970,257.50/128,478.38
  6. Step 6: Final answer
    x = 107,441.97

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1.5x scale

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.