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Finding the Fourth Proportional to 1,121.05, 1,546.99 and 648.87

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Solution

The fourth proportional to 1,121.05, 1,546.99 and 648.87 is: 895.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,121.05 : 1,546.99 = 648.87 : x
  2. Step 2: Convert to fraction form
    1,121.05/1,546.99 = 648.87/x
  3. Step 3: Cross multiply
    1,121.05x = 1,546.99 × 648.87
  4. Step 4: Simplify right side
    1,121.05x = 1,003,795.40
  5. Step 5: Solve for x
    x = 1,003,795.40/1,121.05
  6. Step 6: Final answer
    x = 895.41

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.