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Finding the Fourth Proportional to 245.90, 338.58 and 208.98

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Solution

The fourth proportional to 245.90, 338.58 and 208.98 is: 287.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    245.90 : 338.58 = 208.98 : x
  2. Step 2: Convert to fraction form
    245.90/338.58 = 208.98/x
  3. Step 3: Cross multiply
    245.90x = 338.58 × 208.98
  4. Step 4: Simplify right side
    245.90x = 70,756.45
  5. Step 5: Solve for x
    x = 70,756.45/245.90
  6. Step 6: Final answer
    x = 287.74

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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.