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Finding the Fourth Proportional to 242.99, 335.35 and 138.09

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Solution

The fourth proportional to 242.99, 335.35 and 138.09 is: 190.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.99 : 335.35 = 138.09 : x
  2. Step 2: Convert to fraction form
    242.99/335.35 = 138.09/x
  3. Step 3: Cross multiply
    242.99x = 335.35 × 138.09
  4. Step 4: Simplify right side
    242.99x = 46,307.25
  5. Step 5: Solve for x
    x = 46,307.25/242.99
  6. Step 6: Final answer
    x = 190.57

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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.