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Finding the Fourth Proportional to 678,866.10, 936,731.22 and 392,330.94

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Solution

The fourth proportional to 678,866.10, 936,731.22 and 392,330.94 is: 541,356.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    678,866.10 : 936,731.22 = 392,330.94 : x
  2. Step 2: Convert to fraction form
    678,866.10/936,731.22 = 392,330.94/x
  3. Step 3: Cross multiply
    678,866.10x = 936,731.22 × 392,330.94
  4. Step 4: Simplify right side
    678,866.10x = 367,508,640,069.95
  5. Step 5: Solve for x
    x = 367,508,640,069.95/678,866.10
  6. Step 6: Final answer
    x = 541,356.59

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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.