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Finding the Fourth Proportional to 253.85, 380.79 and 145.53

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Solution

The fourth proportional to 253.85, 380.79 and 145.53 is: 218.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.85 : 380.79 = 145.53 : x
  2. Step 2: Convert to fraction form
    253.85/380.79 = 145.53/x
  3. Step 3: Cross multiply
    253.85x = 380.79 × 145.53
  4. Step 4: Simplify right side
    253.85x = 55,416.37
  5. Step 5: Solve for x
    x = 55,416.37/253.85
  6. Step 6: Final answer
    x = 218.31

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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.