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Finding the Fourth Proportional to 129,398.64, 178,571.97 and 72,040.46

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Solution

The fourth proportional to 129,398.64, 178,571.97 and 72,040.46 is: 99,416.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,398.64 : 178,571.97 = 72,040.46 : x
  2. Step 2: Convert to fraction form
    129,398.64/178,571.97 = 72,040.46/x
  3. Step 3: Cross multiply
    129,398.64x = 178,571.97 × 72,040.46
  4. Step 4: Simplify right side
    129,398.64x = 12,864,407,273.13
  5. Step 5: Solve for x
    x = 12,864,407,273.13/129,398.64
  6. Step 6: Final answer
    x = 99,416.87

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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.