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Finding the Fourth Proportional to 919.51, 1,379.14 and 371.27

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Solution

The fourth proportional to 919.51, 1,379.14 and 371.27 is: 556.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.51 : 1,379.14 = 371.27 : x
  2. Step 2: Convert to fraction form
    919.51/1,379.14 = 371.27/x
  3. Step 3: Cross multiply
    919.51x = 1,379.14 × 371.27
  4. Step 4: Simplify right side
    919.51x = 512,033.31
  5. Step 5: Solve for x
    x = 512,033.31/919.51
  6. Step 6: Final answer
    x = 556.85

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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.