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Finding the Fourth Proportional to 129,786.84, 179,063.88 and 72,416.88

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Solution

The fourth proportional to 129,786.84, 179,063.88 and 72,416.88 is: 99,911.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,786.84 : 179,063.88 = 72,416.88 : x
  2. Step 2: Convert to fraction form
    129,786.84/179,063.88 = 72,416.88/x
  3. Step 3: Cross multiply
    129,786.84x = 179,063.88 × 72,416.88
  4. Step 4: Simplify right side
    129,786.84x = 12,967,247,510.29
  5. Step 5: Solve for x
    x = 12,967,247,510.29/129,786.84
  6. Step 6: Final answer
    x = 99,911.88

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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.