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Finding the Fourth Proportional to 393.70, 543.30 and 219.06

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Solution

The fourth proportional to 393.70, 543.30 and 219.06 is: 302.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.70 : 543.30 = 219.06 : x
  2. Step 2: Convert to fraction form
    393.70/543.30 = 219.06/x
  3. Step 3: Cross multiply
    393.70x = 543.30 × 219.06
  4. Step 4: Simplify right side
    393.70x = 119,015.30
  5. Step 5: Solve for x
    x = 119,015.30/393.70
  6. Step 6: Final answer
    x = 302.30

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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.