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Finding the Fourth Proportional to 254.74, 381.63 and 140.50

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Solution

The fourth proportional to 254.74, 381.63 and 140.50 is: 210.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.74 : 381.63 = 140.50 : x
  2. Step 2: Convert to fraction form
    254.74/381.63 = 140.50/x
  3. Step 3: Cross multiply
    254.74x = 381.63 × 140.50
  4. Step 4: Simplify right side
    254.74x = 53,619.02
  5. Step 5: Solve for x
    x = 53,619.02/254.74
  6. Step 6: Final answer
    x = 210.49

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.