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Finding the Fourth Proportional to 919.59, 1,378.19 and 399.44

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Solution

The fourth proportional to 919.59, 1,378.19 and 399.44 is: 598.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.59 : 1,378.19 = 399.44 : x
  2. Step 2: Convert to fraction form
    919.59/1,378.19 = 399.44/x
  3. Step 3: Cross multiply
    919.59x = 1,378.19 × 399.44
  4. Step 4: Simplify right side
    919.59x = 550,495.33
  5. Step 5: Solve for x
    x = 550,495.33/919.59
  6. Step 6: Final answer
    x = 598.63

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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.