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Finding the Fourth Proportional to 918.72, 1,378.22 and 370.85

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Solution

The fourth proportional to 918.72, 1,378.22 and 370.85 is: 556.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.72 : 1,378.22 = 370.85 : x
  2. Step 2: Convert to fraction form
    918.72/1,378.22 = 370.85/x
  3. Step 3: Cross multiply
    918.72x = 1,378.22 × 370.85
  4. Step 4: Simplify right side
    918.72x = 511,104.14
  5. Step 5: Solve for x
    x = 511,104.14/918.72
  6. Step 6: Final answer
    x = 556.32

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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.