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Finding the Fourth Proportional to 128.40, 192.56 and 59.96

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Solution

The fourth proportional to 128.40, 192.56 and 59.96 is: 89.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.40 : 192.56 = 59.96 : x
  2. Step 2: Convert to fraction form
    128.40/192.56 = 59.96/x
  3. Step 3: Cross multiply
    128.40x = 192.56 × 59.96
  4. Step 4: Simplify right side
    128.40x = 11,544.64
  5. Step 5: Solve for x
    x = 11,544.64/128.40
  6. Step 6: Final answer
    x = 89.91

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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.