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Finding the Fourth Proportional to 192.32, 288.80 and 128.16

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Solution

The fourth proportional to 192.32, 288.80 and 128.16 is: 192.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    192.32 : 288.80 = 128.16 : x
  2. Step 2: Convert to fraction form
    192.32/288.80 = 128.16/x
  3. Step 3: Cross multiply
    192.32x = 288.80 × 128.16
  4. Step 4: Simplify right side
    192.32x = 37,012.61
  5. Step 5: Solve for x
    x = 37,012.61/192.32
  6. Step 6: Final answer
    x = 192.45

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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.