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Finding the Fourth Proportional to 613.76, 919.85 and 266.68

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Solution

The fourth proportional to 613.76, 919.85 and 266.68 is: 399.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.76 : 919.85 = 266.68 : x
  2. Step 2: Convert to fraction form
    613.76/919.85 = 266.68/x
  3. Step 3: Cross multiply
    613.76x = 919.85 × 266.68
  4. Step 4: Simplify right side
    613.76x = 245,303.97
  5. Step 5: Solve for x
    x = 245,303.97/613.76
  6. Step 6: Final answer
    x = 399.68

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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.