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Finding the Fourth Proportional to 394.70, 543.90 and 307.22

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Solution

The fourth proportional to 394.70, 543.90 and 307.22 is: 423.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    394.70 : 543.90 = 307.22 : x
  2. Step 2: Convert to fraction form
    394.70/543.90 = 307.22/x
  3. Step 3: Cross multiply
    394.70x = 543.90 × 307.22
  4. Step 4: Simplify right side
    394.70x = 167,096.96
  5. Step 5: Solve for x
    x = 167,096.96/394.70
  6. Step 6: Final answer
    x = 423.35

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.