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Finding the Fourth Proportional to 129,878.56, 194,839.26 and 45,616.78

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Solution

The fourth proportional to 129,878.56, 194,839.26 and 45,616.78 is: 68,432.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,878.56 : 194,839.26 = 45,616.78 : x
  2. Step 2: Convert to fraction form
    129,878.56/194,839.26 = 45,616.78/x
  3. Step 3: Cross multiply
    129,878.56x = 194,839.26 × 45,616.78
  4. Step 4: Simplify right side
    129,878.56x = 8,887,939,658.78
  5. Step 5: Solve for x
    x = 8,887,939,658.78/129,878.56
  6. Step 6: Final answer
    x = 68,432.69

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1.5x scale

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.