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Finding the Fourth Proportional to 250.36, 345.90 and 208.78

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Solution

The fourth proportional to 250.36, 345.90 and 208.78 is: 288.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    250.36 : 345.90 = 208.78 : x
  2. Step 2: Convert to fraction form
    250.36/345.90 = 208.78/x
  3. Step 3: Cross multiply
    250.36x = 345.90 × 208.78
  4. Step 4: Simplify right side
    250.36x = 72,217.00
  5. Step 5: Solve for x
    x = 72,217.00/250.36
  6. Step 6: Final answer
    x = 288.45

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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.