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Finding the Fourth Proportional to 245.78, 338.76 and 188.91

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Solution

The fourth proportional to 245.78, 338.76 and 188.91 is: 260.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.78 : 338.76 = 188.91 : x
  2. Step 2: Convert to fraction form
    245.78/338.76 = 188.91/x
  3. Step 3: Cross multiply
    245.78x = 338.76 × 188.91
  4. Step 4: Simplify right side
    245.78x = 63,993.67
  5. Step 5: Solve for x
    x = 63,993.67/245.78
  6. Step 6: Final answer
    x = 260.37

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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.