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Finding the Fourth Proportional to 129,719.80, 194,579.70 and 70,670.80

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Solution

The fourth proportional to 129,719.80, 194,579.70 and 70,670.80 is: 106,006.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,719.80 : 194,579.70 = 70,670.80 : x
  2. Step 2: Convert to fraction form
    129,719.80/194,579.70 = 70,670.80/x
  3. Step 3: Cross multiply
    129,719.80x = 194,579.70 × 70,670.80
  4. Step 4: Simplify right side
    129,719.80x = 13,751,103,062.76
  5. Step 5: Solve for x
    x = 13,751,103,062.76/129,719.80
  6. Step 6: Final answer
    x = 106,006.20

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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.