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Finding the Fourth Proportional to 665,346.91, 918,177.83 and 378,867

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Solution

The fourth proportional to 665,346.91, 918,177.83 and 378,867 is: 522,835.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,346.91 : 918,177.83 = 378,867 : x
  2. Step 2: Convert to fraction form
    665,346.91/918,177.83 = 378,867/x
  3. Step 3: Cross multiply
    665,346.91x = 918,177.83 × 378,867
  4. Step 4: Simplify right side
    665,346.91x = 347,867,279,918.61
  5. Step 5: Solve for x
    x = 347,867,279,918.61/665,346.91
  6. Step 6: Final answer
    x = 522,835.94

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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.