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Finding the Fourth Proportional to 128.61, 192.89 and 60.06

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Solution

The fourth proportional to 128.61, 192.89 and 60.06 is: 90.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.61 : 192.89 = 60.06 : x
  2. Step 2: Convert to fraction form
    128.61/192.89 = 60.06/x
  3. Step 3: Cross multiply
    128.61x = 192.89 × 60.06
  4. Step 4: Simplify right side
    128.61x = 11,584.67
  5. Step 5: Solve for x
    x = 11,584.67/128.61
  6. Step 6: Final answer
    x = 90.08

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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.