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Finding the Fourth Proportional to 2,072.16, 3,108.72 and 918

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Solution

The fourth proportional to 2,072.16, 3,108.72 and 918 is: 1,377.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,072.16 : 3,108.72 = 918 : x
  2. Step 2: Convert to fraction form
    2,072.16/3,108.72 = 918/x
  3. Step 3: Cross multiply
    2,072.16x = 3,108.72 × 918
  4. Step 4: Simplify right side
    2,072.16x = 2,853,804.96
  5. Step 5: Solve for x
    x = 2,853,804.96/2,072.16
  6. Step 6: Final answer
    x = 1,377.21

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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.