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Finding the Fourth Proportional to 251,608.78, 347,213.01 and 138,431.54

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Solution

The fourth proportional to 251,608.78, 347,213.01 and 138,431.54 is: 191,031.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    251,608.78 : 347,213.01 = 138,431.54 : x
  2. Step 2: Convert to fraction form
    251,608.78/347,213.01 = 138,431.54/x
  3. Step 3: Cross multiply
    251,608.78x = 347,213.01 × 138,431.54
  4. Step 4: Simplify right side
    251,608.78x = 48,065,231,682.34
  5. Step 5: Solve for x
    x = 48,065,231,682.34/251,608.78
  6. Step 6: Final answer
    x = 191,031.62

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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.