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Finding the Fourth Proportional to 678,866.91, 936,732.20 and 392,331.66

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Solution

The fourth proportional to 678,866.91, 936,732.20 and 392,331.66 is: 541,357.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,866.91 : 936,732.20 = 392,331.66 : x
  2. Step 2: Convert to fraction form
    678,866.91/936,732.20 = 392,331.66/x
  3. Step 3: Cross multiply
    678,866.91x = 936,732.20 × 392,331.66
  4. Step 4: Simplify right side
    678,866.91x = 367,509,697,039.79
  5. Step 5: Solve for x
    x = 367,509,697,039.79/678,866.91
  6. Step 6: Final answer
    x = 541,357.51

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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.