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Finding the Fourth Proportional to 243.49, 365.38 and 128.01

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Solution

The fourth proportional to 243.49, 365.38 and 128.01 is: 192.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    243.49 : 365.38 = 128.01 : x
  2. Step 2: Convert to fraction form
    243.49/365.38 = 128.01/x
  3. Step 3: Cross multiply
    243.49x = 365.38 × 128.01
  4. Step 4: Simplify right side
    243.49x = 46,773.88
  5. Step 5: Solve for x
    x = 46,773.88/243.49
  6. Step 6: Final answer
    x = 192.10

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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.