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Finding the Fourth Proportional to 254.54, 351.31 and 156.30

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Solution

The fourth proportional to 254.54, 351.31 and 156.30 is: 215.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.54 : 351.31 = 156.30 : x
  2. Step 2: Convert to fraction form
    254.54/351.31 = 156.30/x
  3. Step 3: Cross multiply
    254.54x = 351.31 × 156.30
  4. Step 4: Simplify right side
    254.54x = 54,911.74
  5. Step 5: Solve for x
    x = 54,911.74/254.54
  6. Step 6: Final answer
    x = 215.73

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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.