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Finding the Fourth Proportional to 665,344.91, 918,175.08 and 378,865

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Solution

The fourth proportional to 665,344.91, 918,175.08 and 378,865 is: 522,833.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,344.91 : 918,175.08 = 378,865 : x
  2. Step 2: Convert to fraction form
    665,344.91/918,175.08 = 378,865/x
  3. Step 3: Cross multiply
    665,344.91x = 918,175.08 × 378,865
  4. Step 4: Simplify right side
    665,344.91x = 347,864,399,789.88
  5. Step 5: Solve for x
    x = 347,864,399,789.88/665,344.91
  6. Step 6: Final answer
    x = 522,833.19

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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.