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Finding the Fourth Proportional to 918.70, 1,379.04 and 371.26

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Solution

The fourth proportional to 918.70, 1,379.04 and 371.26 is: 557.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    918.70 : 1,379.04 = 371.26 : x
  2. Step 2: Convert to fraction form
    918.70/1,379.04 = 371.26/x
  3. Step 3: Cross multiply
    918.70x = 1,379.04 × 371.26
  4. Step 4: Simplify right side
    918.70x = 511,982.39
  5. Step 5: Solve for x
    x = 511,982.39/918.70
  6. Step 6: Final answer
    x = 557.29

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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.