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Finding the Fourth Proportional to 146.35, 218.45 and 128.13

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Solution

The fourth proportional to 146.35, 218.45 and 128.13 is: 191.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    146.35 : 218.45 = 128.13 : x
  2. Step 2: Convert to fraction form
    146.35/218.45 = 128.13/x
  3. Step 3: Cross multiply
    146.35x = 218.45 × 128.13
  4. Step 4: Simplify right side
    146.35x = 27,990.00
  5. Step 5: Solve for x
    x = 27,990.00/146.35
  6. Step 6: Final answer
    x = 191.25

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.