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Finding the Fourth Proportional to 173.51, 239.78 and 155.06

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Solution

The fourth proportional to 173.51, 239.78 and 155.06 is: 214.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    173.51 : 239.78 = 155.06 : x
  2. Step 2: Convert to fraction form
    173.51/239.78 = 155.06/x
  3. Step 3: Cross multiply
    173.51x = 239.78 × 155.06
  4. Step 4: Simplify right side
    173.51x = 37,179.48
  5. Step 5: Solve for x
    x = 37,179.48/173.51
  6. Step 6: Final answer
    x = 214.28

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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.