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Finding the Fourth Proportional to 129,508.80, 194,263.20 and 76,891.20

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Solution

The fourth proportional to 129,508.80, 194,263.20 and 76,891.20 is: 115,336.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,508.80 : 194,263.20 = 76,891.20 : x
  2. Step 2: Convert to fraction form
    129,508.80/194,263.20 = 76,891.20/x
  3. Step 3: Cross multiply
    129,508.80x = 194,263.20 × 76,891.20
  4. Step 4: Simplify right side
    129,508.80x = 14,937,130,563.84
  5. Step 5: Solve for x
    x = 14,937,130,563.84/129,508.80
  6. Step 6: Final answer
    x = 115,336.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.