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Finding the Fourth Proportional to 129,993.49, 179,392.20 and 76,279.40

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Solution

The fourth proportional to 129,993.49, 179,392.20 and 76,279.40 is: 105,266.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,993.49 : 179,392.20 = 76,279.40 : x
  2. Step 2: Convert to fraction form
    129,993.49/179,392.20 = 76,279.40/x
  3. Step 3: Cross multiply
    129,993.49x = 179,392.20 × 76,279.40
  4. Step 4: Simplify right side
    129,993.49x = 13,683,929,380.68
  5. Step 5: Solve for x
    x = 13,683,929,380.68/129,993.49
  6. Step 6: Final answer
    x = 105,266.27

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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.