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Finding the Fourth Proportional to 128.61, 192.74 and 94.39

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Solution

The fourth proportional to 128.61, 192.74 and 94.39 is: 141.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.61 : 192.74 = 94.39 : x
  2. Step 2: Convert to fraction form
    128.61/192.74 = 94.39/x
  3. Step 3: Cross multiply
    128.61x = 192.74 × 94.39
  4. Step 4: Simplify right side
    128.61x = 18,191.77
  5. Step 5: Solve for x
    x = 18,191.77/128.61
  6. Step 6: Final answer
    x = 141.45

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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.