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Finding the Fourth Proportional to 919.26, 1,378.68 and 302.82

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Solution

The fourth proportional to 919.26, 1,378.68 and 302.82 is: 454.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.26 : 1,378.68 = 302.82 : x
  2. Step 2: Convert to fraction form
    919.26/1,378.68 = 302.82/x
  3. Step 3: Cross multiply
    919.26x = 1,378.68 × 302.82
  4. Step 4: Simplify right side
    919.26x = 417,491.88
  5. Step 5: Solve for x
    x = 417,491.88/919.26
  6. Step 6: Final answer
    x = 454.16

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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.