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Finding the Fourth Proportional to 128,331.78, 192,423.78 and 49,435.74

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Solution

The fourth proportional to 128,331.78, 192,423.78 and 49,435.74 is: 74,125.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,331.78 : 192,423.78 = 49,435.74 : x
  2. Step 2: Convert to fraction form
    128,331.78/192,423.78 = 49,435.74/x
  3. Step 3: Cross multiply
    128,331.78x = 192,423.78 × 49,435.74
  4. Step 4: Simplify right side
    128,331.78x = 9,512,611,957.90
  5. Step 5: Solve for x
    x = 9,512,611,957.90/128,331.78
  6. Step 6: Final answer
    x = 74,125.15

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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.