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Finding the Fourth Proportional to 254.70, 351.12 and 156.39

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Solution

The fourth proportional to 254.70, 351.12 and 156.39 is: 215.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.70 : 351.12 = 156.39 : x
  2. Step 2: Convert to fraction form
    254.70/351.12 = 156.39/x
  3. Step 3: Cross multiply
    254.70x = 351.12 × 156.39
  4. Step 4: Simplify right side
    254.70x = 54,911.66
  5. Step 5: Solve for x
    x = 54,911.66/254.70
  6. Step 6: Final answer
    x = 215.59

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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.