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Finding the Fourth Proportional to 155.75, 214.56 and 138.26

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Solution

The fourth proportional to 155.75, 214.56 and 138.26 is: 190.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.75 : 214.56 = 138.26 : x
  2. Step 2: Convert to fraction form
    155.75/214.56 = 138.26/x
  3. Step 3: Cross multiply
    155.75x = 214.56 × 138.26
  4. Step 4: Simplify right side
    155.75x = 29,663.99
  5. Step 5: Solve for x
    x = 29,663.99/155.75
  6. Step 6: Final answer
    x = 190.47

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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.