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Finding the Fourth Proportional to 893.89, 1,231.90 and 644.77

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Solution

The fourth proportional to 893.89, 1,231.90 and 644.77 is: 888.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.89 : 1,231.90 = 644.77 : x
  2. Step 2: Convert to fraction form
    893.89/1,231.90 = 644.77/x
  3. Step 3: Cross multiply
    893.89x = 1,231.90 × 644.77
  4. Step 4: Simplify right side
    893.89x = 794,292.16
  5. Step 5: Solve for x
    x = 794,292.16/893.89
  6. Step 6: Final answer
    x = 888.58

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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.