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Finding the Fourth Proportional to 667,618.56, 921,314.07 and 395,820.54

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Solution

The fourth proportional to 667,618.56, 921,314.07 and 395,820.54 is: 546,232.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    667,618.56 : 921,314.07 = 395,820.54 : x
  2. Step 2: Convert to fraction form
    667,618.56/921,314.07 = 395,820.54/x
  3. Step 3: Cross multiply
    667,618.56x = 921,314.07 × 395,820.54
  4. Step 4: Simplify right side
    667,618.56x = 364,675,032,697.00
  5. Step 5: Solve for x
    x = 364,675,032,697.00/667,618.56
  6. Step 6: Final answer
    x = 546,232.62

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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.