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Finding the Fourth Proportional to 255.78, 350.70 and 253.68

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Solution

The fourth proportional to 255.78, 350.70 and 253.68 is: 347.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.78 : 350.70 = 253.68 : x
  2. Step 2: Convert to fraction form
    255.78/350.70 = 253.68/x
  3. Step 3: Cross multiply
    255.78x = 350.70 × 253.68
  4. Step 4: Simplify right side
    255.78x = 88,965.58
  5. Step 5: Solve for x
    x = 88,965.58/255.78
  6. Step 6: Final answer
    x = 347.82

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.