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Finding the Fourth Proportional to 665,464.36, 918,234.66 and 378,989.80

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Solution

The fourth proportional to 665,464.36, 918,234.66 and 378,989.80 is: 522,945.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,464.36 : 918,234.66 = 378,989.80 : x
  2. Step 2: Convert to fraction form
    665,464.36/918,234.66 = 378,989.80/x
  3. Step 3: Cross multiply
    665,464.36x = 918,234.66 × 378,989.80
  4. Step 4: Simplify right side
    665,464.36x = 348,001,570,146.47
  5. Step 5: Solve for x
    x = 348,001,570,146.47/665,464.36
  6. Step 6: Final answer
    x = 522,945.47

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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.