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Finding the Fourth Proportional to 129,334.41, 178,479.75 and 72,745.80

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Solution

The fourth proportional to 129,334.41, 178,479.75 and 72,745.80 is: 100,388.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,334.41 : 178,479.75 = 72,745.80 : x
  2. Step 2: Convert to fraction form
    129,334.41/178,479.75 = 72,745.80/x
  3. Step 3: Cross multiply
    129,334.41x = 178,479.75 × 72,745.80
  4. Step 4: Simplify right side
    129,334.41x = 12,983,652,197.55
  5. Step 5: Solve for x
    x = 12,983,652,197.55/129,334.41
  6. Step 6: Final answer
    x = 100,388.23

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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.