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Finding the Fourth Proportional to 394,426.80, 591,640.20 and 390,279.60

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Solution

The fourth proportional to 394,426.80, 591,640.20 and 390,279.60 is: 585,419.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,426.80 : 591,640.20 = 390,279.60 : x
  2. Step 2: Convert to fraction form
    394,426.80/591,640.20 = 390,279.60/x
  3. Step 3: Cross multiply
    394,426.80x = 591,640.20 × 390,279.60
  4. Step 4: Simplify right side
    394,426.80x = 230,905,100,599.92
  5. Step 5: Solve for x
    x = 230,905,100,599.92/394,426.80
  6. Step 6: Final answer
    x = 585,419.40

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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.