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Finding the Fourth Proportional to 2,153.36, 3,227.88 and 920

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Solution

The fourth proportional to 2,153.36, 3,227.88 and 920 is: 1,379.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,153.36 : 3,227.88 = 920 : x
  2. Step 2: Convert to fraction form
    2,153.36/3,227.88 = 920/x
  3. Step 3: Cross multiply
    2,153.36x = 3,227.88 × 920
  4. Step 4: Simplify right side
    2,153.36x = 2,969,649.60
  5. Step 5: Solve for x
    x = 2,969,649.60/2,153.36
  6. Step 6: Final answer
    x = 1,379.08

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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.