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Finding the Fourth Proportional to 678,798.27, 936,530.91 and 392,213.79

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Solution

The fourth proportional to 678,798.27, 936,530.91 and 392,213.79 is: 541,133.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,798.27 : 936,530.91 = 392,213.79 : x
  2. Step 2: Convert to fraction form
    678,798.27/936,530.91 = 392,213.79/x
  3. Step 3: Cross multiply
    678,798.27x = 936,530.91 × 392,213.79
  4. Step 4: Simplify right side
    678,798.27x = 367,320,337,663.25
  5. Step 5: Solve for x
    x = 367,320,337,663.25/678,798.27
  6. Step 6: Final answer
    x = 541,133.28

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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.