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Finding the Fourth Proportional to 235.78, 325.30 and 142.56

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Solution

The fourth proportional to 235.78, 325.30 and 142.56 is: 196.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.78 : 325.30 = 142.56 : x
  2. Step 2: Convert to fraction form
    235.78/325.30 = 142.56/x
  3. Step 3: Cross multiply
    235.78x = 325.30 × 142.56
  4. Step 4: Simplify right side
    235.78x = 46,374.77
  5. Step 5: Solve for x
    x = 46,374.77/235.78
  6. Step 6: Final answer
    x = 196.69

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.