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Finding the Fourth Proportional to 242.91, 335.19 and 138.01

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Solution

The fourth proportional to 242.91, 335.19 and 138.01 is: 190.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.91 : 335.19 = 138.01 : x
  2. Step 2: Convert to fraction form
    242.91/335.19 = 138.01/x
  3. Step 3: Cross multiply
    242.91x = 335.19 × 138.01
  4. Step 4: Simplify right side
    242.91x = 46,257.90
  5. Step 5: Solve for x
    x = 46,257.90/242.91
  6. Step 6: Final answer
    x = 190.43

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.