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Finding the Fourth Proportional to 394,078.50, 543,841.29 and 215,230.50

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Solution

The fourth proportional to 394,078.50, 543,841.29 and 215,230.50 is: 297,025.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    394,078.50 : 543,841.29 = 215,230.50 : x
  2. Step 2: Convert to fraction form
    394,078.50/543,841.29 = 215,230.50/x
  3. Step 3: Cross multiply
    394,078.50x = 543,841.29 × 215,230.50
  4. Step 4: Simplify right side
    394,078.50x = 117,051,232,767.35
  5. Step 5: Solve for x
    x = 117,051,232,767.35/394,078.50
  6. Step 6: Final answer
    x = 297,025.17

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1.5x scale

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.