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Finding the Fourth Proportional to 428,997.62, 643,625.60 and 386,679.17

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Solution

The fourth proportional to 428,997.62, 643,625.60 and 386,679.17 is: 580,135.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,997.62 : 643,625.60 = 386,679.17 : x
  2. Step 2: Convert to fraction form
    428,997.62/643,625.60 = 386,679.17/x
  3. Step 3: Cross multiply
    428,997.62x = 643,625.60 × 386,679.17
  4. Step 4: Simplify right side
    428,997.62x = 248,876,607,647.23
  5. Step 5: Solve for x
    x = 248,876,607,647.23/428,997.62
  6. Step 6: Final answer
    x = 580,135.18

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.