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Finding the Fourth Proportional to 253.80, 378.45 and 231.40

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Solution

The fourth proportional to 253.80, 378.45 and 231.40 is: 345.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    253.80 : 378.45 = 231.40 : x
  2. Step 2: Convert to fraction form
    253.80/378.45 = 231.40/x
  3. Step 3: Cross multiply
    253.80x = 378.45 × 231.40
  4. Step 4: Simplify right side
    253.80x = 87,573.33
  5. Step 5: Solve for x
    x = 87,573.33/253.80
  6. Step 6: Final answer
    x = 345.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.