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Finding the Fourth Proportional to 665,173.60, 917,940.43 and 378,693.68

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Solution

The fourth proportional to 665,173.60, 917,940.43 and 378,693.68 is: 522,597.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,173.60 : 917,940.43 = 378,693.68 : x
  2. Step 2: Convert to fraction form
    665,173.60/917,940.43 = 378,693.68/x
  3. Step 3: Cross multiply
    665,173.60x = 917,940.43 × 378,693.68
  4. Step 4: Simplify right side
    665,173.60x = 347,618,240,504.56
  5. Step 5: Solve for x
    x = 347,618,240,504.56/665,173.60
  6. Step 6: Final answer
    x = 522,597.77

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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.