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Finding the Fourth Proportional to 394,887.76, 592,331.20 and 128,647.84

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Solution

The fourth proportional to 394,887.76, 592,331.20 and 128,647.84 is: 192,971.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,887.76 : 592,331.20 = 128,647.84 : x
  2. Step 2: Convert to fraction form
    394,887.76/592,331.20 = 128,647.84/x
  3. Step 3: Cross multiply
    394,887.76x = 592,331.20 × 128,647.84
  4. Step 4: Simplify right side
    394,887.76x = 76,202,129,444.61
  5. Step 5: Solve for x
    x = 76,202,129,444.61/394,887.76
  6. Step 6: Final answer
    x = 192,971.62

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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.