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Finding the Fourth Proportional to 284.80, 393.76 and 238.16

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Solution

The fourth proportional to 284.80, 393.76 and 238.16 is: 329.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    284.80 : 393.76 = 238.16 : x
  2. Step 2: Convert to fraction form
    284.80/393.76 = 238.16/x
  3. Step 3: Cross multiply
    284.80x = 393.76 × 238.16
  4. Step 4: Simplify right side
    284.80x = 93,777.88
  5. Step 5: Solve for x
    x = 93,777.88/284.80
  6. Step 6: Final answer
    x = 329.28

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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.