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Finding the Fourth Proportional to 128,614.92, 177,478.74 and 72,018.60

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Solution

The fourth proportional to 128,614.92, 177,478.74 and 72,018.60 is: 99,380.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,614.92 : 177,478.74 = 72,018.60 : x
  2. Step 2: Convert to fraction form
    128,614.92/177,478.74 = 72,018.60/x
  3. Step 3: Cross multiply
    128,614.92x = 177,478.74 × 72,018.60
  4. Step 4: Simplify right side
    128,614.92x = 12,781,770,384.56
  5. Step 5: Solve for x
    x = 12,781,770,384.56/128,614.92
  6. Step 6: Final answer
    x = 99,380.15

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.