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Finding the Fourth Proportional to 245.52, 338.78 and 142

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Solution

The fourth proportional to 245.52, 338.78 and 142 is: 195.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.52 : 338.78 = 142 : x
  2. Step 2: Convert to fraction form
    245.52/338.78 = 142/x
  3. Step 3: Cross multiply
    245.52x = 338.78 × 142
  4. Step 4: Simplify right side
    245.52x = 48,106.76
  5. Step 5: Solve for x
    x = 48,106.76/245.52
  6. Step 6: Final answer
    x = 195.94

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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.