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Finding the Fourth Proportional to 128.55, 192.88 and 60.08

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Solution

The fourth proportional to 128.55, 192.88 and 60.08 is: 90.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.55 : 192.88 = 60.08 : x
  2. Step 2: Convert to fraction form
    128.55/192.88 = 60.08/x
  3. Step 3: Cross multiply
    128.55x = 192.88 × 60.08
  4. Step 4: Simplify right side
    128.55x = 11,588.97
  5. Step 5: Solve for x
    x = 11,588.97/128.55
  6. Step 6: Final answer
    x = 90.15

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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.