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Finding the Fourth Proportional to 1,042.86, 1,439.22 and 644.61

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Solution

The fourth proportional to 1,042.86, 1,439.22 and 644.61 is: 889.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.86 : 1,439.22 = 644.61 : x
  2. Step 2: Convert to fraction form
    1,042.86/1,439.22 = 644.61/x
  3. Step 3: Cross multiply
    1,042.86x = 1,439.22 × 644.61
  4. Step 4: Simplify right side
    1,042.86x = 927,735.60
  5. Step 5: Solve for x
    x = 927,735.60/1,042.86
  6. Step 6: Final answer
    x = 889.61

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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.