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Finding the Fourth Proportional to 254.20, 380.88 and 145.80

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Solution

The fourth proportional to 254.20, 380.88 and 145.80 is: 218.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    254.20 : 380.88 = 145.80 : x
  2. Step 2: Convert to fraction form
    254.20/380.88 = 145.80/x
  3. Step 3: Cross multiply
    254.20x = 380.88 × 145.80
  4. Step 4: Simplify right side
    254.20x = 55,532.30
  5. Step 5: Solve for x
    x = 55,532.30/254.20
  6. Step 6: Final answer
    x = 218.46

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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.