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Finding the Fourth Proportional to 242.75, 335 and 139.25

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Solution

The fourth proportional to 242.75, 335 and 139.25 is: 192.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.75 : 335 = 139.25 : x
  2. Step 2: Convert to fraction form
    242.75/335 = 139.25/x
  3. Step 3: Cross multiply
    242.75x = 335 × 139.25
  4. Step 4: Simplify right side
    242.75x = 46,648.75
  5. Step 5: Solve for x
    x = 46,648.75/242.75
  6. Step 6: Final answer
    x = 192.17

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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.