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Finding the Fourth Proportional to 238.16, 356.84 and 128.32

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Solution

The fourth proportional to 238.16, 356.84 and 128.32 is: 192.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    238.16 : 356.84 = 128.32 : x
  2. Step 2: Convert to fraction form
    238.16/356.84 = 128.32/x
  3. Step 3: Cross multiply
    238.16x = 356.84 × 128.32
  4. Step 4: Simplify right side
    238.16x = 45,789.71
  5. Step 5: Solve for x
    x = 45,789.71/238.16
  6. Step 6: Final answer
    x = 192.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.