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Finding the Fourth Proportional to 664,980.85, 917,679.44 and 378,519.38

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Solution

The fourth proportional to 664,980.85, 917,679.44 and 378,519.38 is: 522,360.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    664,980.85 : 917,679.44 = 378,519.38 : x
  2. Step 2: Convert to fraction form
    664,980.85/917,679.44 = 378,519.38/x
  3. Step 3: Cross multiply
    664,980.85x = 917,679.44 × 378,519.38
  4. Step 4: Simplify right side
    664,980.85x = 347,359,452,667.55
  5. Step 5: Solve for x
    x = 347,359,452,667.55/664,980.85
  6. Step 6: Final answer
    x = 522,360.08

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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.