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Finding the Fourth Proportional to 665,310.60, 918,129.62 and 378,830.92

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Solution

The fourth proportional to 665,310.60, 918,129.62 and 378,830.92 is: 522,787.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,310.60 : 918,129.62 = 378,830.92 : x
  2. Step 2: Convert to fraction form
    665,310.60/918,129.62 = 378,830.92/x
  3. Step 3: Cross multiply
    665,310.60x = 918,129.62 × 378,830.92
  4. Step 4: Simplify right side
    665,310.60x = 347,815,888,623.85
  5. Step 5: Solve for x
    x = 347,815,888,623.85/665,310.60
  6. Step 6: Final answer
    x = 522,787.23

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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.