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Finding the Fourth Proportional to 128.56, 192.90 and 63.63

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Solution

The fourth proportional to 128.56, 192.90 and 63.63 is: 95.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.56 : 192.90 = 63.63 : x
  2. Step 2: Convert to fraction form
    128.56/192.90 = 63.63/x
  3. Step 3: Cross multiply
    128.56x = 192.90 × 63.63
  4. Step 4: Simplify right side
    128.56x = 12,273.50
  5. Step 5: Solve for x
    x = 12,273.50/128.56
  6. Step 6: Final answer
    x = 95.47

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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.