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Finding the Fourth Proportional to 919.37, 1,378.49 and 627.23

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Solution

The fourth proportional to 919.37, 1,378.49 and 627.23 is: 940.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.37 : 1,378.49 = 627.23 : x
  2. Step 2: Convert to fraction form
    919.37/1,378.49 = 627.23/x
  3. Step 3: Cross multiply
    919.37x = 1,378.49 × 627.23
  4. Step 4: Simplify right side
    919.37x = 864,620.25
  5. Step 5: Solve for x
    x = 864,620.25/919.37
  6. Step 6: Final answer
    x = 940.45

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Double scale
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1.5x scale

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.