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Finding the Fourth Proportional to 678,814.28, 936,553 and 392,229.80

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Solution

The fourth proportional to 678,814.28, 936,553 and 392,229.80 is: 541,155.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,814.28 : 936,553 = 392,229.80 : x
  2. Step 2: Convert to fraction form
    678,814.28/936,553 = 392,229.80/x
  3. Step 3: Cross multiply
    678,814.28x = 936,553 × 392,229.80
  4. Step 4: Simplify right side
    678,814.28x = 367,343,995,879.40
  5. Step 5: Solve for x
    x = 367,343,995,879.40/678,814.28
  6. Step 6: Final answer
    x = 541,155.37

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.