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Finding the Fourth Proportional to 981,391.20, 1,472,086.80 and 768,814.80

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Solution

The fourth proportional to 981,391.20, 1,472,086.80 and 768,814.80 is: 1,153,222.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    981,391.20 : 1,472,086.80 = 768,814.80 : x
  2. Step 2: Convert to fraction form
    981,391.20/1,472,086.80 = 768,814.80/x
  3. Step 3: Cross multiply
    981,391.20x = 1,472,086.80 × 768,814.80
  4. Step 4: Simplify right side
    981,391.20x = 1,131,762,118,724.64
  5. Step 5: Solve for x
    x = 1,131,762,118,724.64/981,391.20
  6. Step 6: Final answer
    x = 1,153,222.20

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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.