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Finding the Fourth Proportional to 919.64, 1,379.60 and 270.42

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Solution

The fourth proportional to 919.64, 1,379.60 and 270.42 is: 405.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.64 : 1,379.60 = 270.42 : x
  2. Step 2: Convert to fraction form
    919.64/1,379.60 = 270.42/x
  3. Step 3: Cross multiply
    919.64x = 1,379.60 × 270.42
  4. Step 4: Simplify right side
    919.64x = 373,071.43
  5. Step 5: Solve for x
    x = 373,071.43/919.64
  6. Step 6: Final answer
    x = 405.67

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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.