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Finding the Fourth Proportional to 254.40, 351.05 and 143.91

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Solution

The fourth proportional to 254.40, 351.05 and 143.91 is: 198.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.40 : 351.05 = 143.91 : x
  2. Step 2: Convert to fraction form
    254.40/351.05 = 143.91/x
  3. Step 3: Cross multiply
    254.40x = 351.05 × 143.91
  4. Step 4: Simplify right side
    254.40x = 50,518.89
  5. Step 5: Solve for x
    x = 50,518.89/254.40
  6. Step 6: Final answer
    x = 198.58

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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.