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Finding the Fourth Proportional to 394,876.78, 592,314.70 and 128,636.86

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Solution

The fourth proportional to 394,876.78, 592,314.70 and 128,636.86 is: 192,955.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,876.78 : 592,314.70 = 128,636.86 : x
  2. Step 2: Convert to fraction form
    394,876.78/592,314.70 = 128,636.86/x
  3. Step 3: Cross multiply
    394,876.78x = 592,314.70 × 128,636.86
  4. Step 4: Simplify right side
    394,876.78x = 76,193,503,139.84
  5. Step 5: Solve for x
    x = 76,193,503,139.84/394,876.78
  6. Step 6: Final answer
    x = 192,955.14

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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.