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Finding the Fourth Proportional to 655,336.80, 981,036.90 and 388,960.20

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Solution

The fourth proportional to 655,336.80, 981,036.90 and 388,960.20 is: 582,272.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    655,336.80 : 981,036.90 = 388,960.20 : x
  2. Step 2: Convert to fraction form
    655,336.80/981,036.90 = 388,960.20/x
  3. Step 3: Cross multiply
    655,336.80x = 981,036.90 × 388,960.20
  4. Step 4: Simplify right side
    655,336.80x = 381,584,308,831.38
  5. Step 5: Solve for x
    x = 381,584,308,831.38/655,336.80
  6. Step 6: Final answer
    x = 582,272.06

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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.