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Finding the Fourth Proportional to 919.67, 1,378.59 and 371.69

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Solution

The fourth proportional to 919.67, 1,378.59 and 371.69 is: 557.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    919.67 : 1,378.59 = 371.69 : x
  2. Step 2: Convert to fraction form
    919.67/1,378.59 = 371.69/x
  3. Step 3: Cross multiply
    919.67x = 1,378.59 × 371.69
  4. Step 4: Simplify right side
    919.67x = 512,408.12
  5. Step 5: Solve for x
    x = 512,408.12/919.67
  6. Step 6: Final answer
    x = 557.17

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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.