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Finding the Fourth Proportional to 394.93, 545 and 217.90

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Solution

The fourth proportional to 394.93, 545 and 217.90 is: 300.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.93 : 545 = 217.90 : x
  2. Step 2: Convert to fraction form
    394.93/545 = 217.90/x
  3. Step 3: Cross multiply
    394.93x = 545 × 217.90
  4. Step 4: Simplify right side
    394.93x = 118,755.50
  5. Step 5: Solve for x
    x = 118,755.50/394.93
  6. Step 6: Final answer
    x = 300.70

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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.