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Finding the Fourth Proportional to 285.65, 393.18 and 238.49

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Solution

The fourth proportional to 285.65, 393.18 and 238.49 is: 328.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.65 : 393.18 = 238.49 : x
  2. Step 2: Convert to fraction form
    285.65/393.18 = 238.49/x
  3. Step 3: Cross multiply
    285.65x = 393.18 × 238.49
  4. Step 4: Simplify right side
    285.65x = 93,769.50
  5. Step 5: Solve for x
    x = 93,769.50/285.65
  6. Step 6: Final answer
    x = 328.27

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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.