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Finding the Fourth Proportional to 266.25, 398.62 and 205.50

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Solution

The fourth proportional to 266.25, 398.62 and 205.50 is: 307.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    266.25 : 398.62 = 205.50 : x
  2. Step 2: Convert to fraction form
    266.25/398.62 = 205.50/x
  3. Step 3: Cross multiply
    266.25x = 398.62 × 205.50
  4. Step 4: Simplify right side
    266.25x = 81,918.16
  5. Step 5: Solve for x
    x = 81,918.16/266.25
  6. Step 6: Final answer
    x = 307.67

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.