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Finding the Fourth Proportional to 212,894.01, 318,979.53 and 128,476.80

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Solution

The fourth proportional to 212,894.01, 318,979.53 and 128,476.80 is: 192,497.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,894.01 : 318,979.53 = 128,476.80 : x
  2. Step 2: Convert to fraction form
    212,894.01/318,979.53 = 128,476.80/x
  3. Step 3: Cross multiply
    212,894.01x = 318,979.53 × 128,476.80
  4. Step 4: Simplify right side
    212,894.01x = 40,981,469,279.90
  5. Step 5: Solve for x
    x = 40,981,469,279.90/212,894.01
  6. Step 6: Final answer
    x = 192,497.05

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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.