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Finding the Fourth Proportional to 1,093.88, 1,640.28 and 990.20

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Solution

The fourth proportional to 1,093.88, 1,640.28 and 990.20 is: 1,484.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,093.88 : 1,640.28 = 990.20 : x
  2. Step 2: Convert to fraction form
    1,093.88/1,640.28 = 990.20/x
  3. Step 3: Cross multiply
    1,093.88x = 1,640.28 × 990.20
  4. Step 4: Simplify right side
    1,093.88x = 1,624,205.26
  5. Step 5: Solve for x
    x = 1,624,205.26/1,093.88
  6. Step 6: Final answer
    x = 1,484.81

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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.