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Finding the Fourth Proportional to 613, 919.75 and 266.15

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Solution

The fourth proportional to 613, 919.75 and 266.15 is: 399.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    613 : 919.75 = 266.15 : x
  2. Step 2: Convert to fraction form
    613/919.75 = 266.15/x
  3. Step 3: Cross multiply
    613x = 919.75 × 266.15
  4. Step 4: Simplify right side
    613x = 244,791.46
  5. Step 5: Solve for x
    x = 244,791.46/613
  6. Step 6: Final answer
    x = 399.33

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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.