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Finding the Fourth Proportional to 919.41, 1,269.89 and 670.33

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Solution

The fourth proportional to 919.41, 1,269.89 and 670.33 is: 925.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.41 : 1,269.89 = 670.33 : x
  2. Step 2: Convert to fraction form
    919.41/1,269.89 = 670.33/x
  3. Step 3: Cross multiply
    919.41x = 1,269.89 × 670.33
  4. Step 4: Simplify right side
    919.41x = 851,242.01
  5. Step 5: Solve for x
    x = 851,242.01/919.41
  6. Step 6: Final answer
    x = 925.86

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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.