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Finding the Fourth Proportional to 128,400.38, 192,688.05 and 45,294.38

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Solution

The fourth proportional to 128,400.38, 192,688.05 and 45,294.38 is: 67,972.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,400.38 : 192,688.05 = 45,294.38 : x
  2. Step 2: Convert to fraction form
    128,400.38/192,688.05 = 45,294.38/x
  3. Step 3: Cross multiply
    128,400.38x = 192,688.05 × 45,294.38
  4. Step 4: Simplify right side
    128,400.38x = 8,727,684,794.72
  5. Step 5: Solve for x
    x = 8,727,684,794.72/128,400.38
  6. Step 6: Final answer
    x = 67,972.42

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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.