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Finding the Fourth Proportional to 285.93, 393.89 and 220.41

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Solution

The fourth proportional to 285.93, 393.89 and 220.41 is: 303.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.93 : 393.89 = 220.41 : x
  2. Step 2: Convert to fraction form
    285.93/393.89 = 220.41/x
  3. Step 3: Cross multiply
    285.93x = 393.89 × 220.41
  4. Step 4: Simplify right side
    285.93x = 86,816.19
  5. Step 5: Solve for x
    x = 86,816.19/285.93
  6. Step 6: Final answer
    x = 303.63

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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.