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Finding the Fourth Proportional to 146.08, 218.76 and 128.08

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Solution

The fourth proportional to 146.08, 218.76 and 128.08 is: 191.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.08 : 218.76 = 128.08 : x
  2. Step 2: Convert to fraction form
    146.08/218.76 = 128.08/x
  3. Step 3: Cross multiply
    146.08x = 218.76 × 128.08
  4. Step 4: Simplify right side
    146.08x = 28,018.78
  5. Step 5: Solve for x
    x = 28,018.78/146.08
  6. Step 6: Final answer
    x = 191.80

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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.