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Finding the Fourth Proportional to 893.36, 1,231.68 and 644.48

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Solution

The fourth proportional to 893.36, 1,231.68 and 644.48 is: 888.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    893.36 : 1,231.68 = 644.48 : x
  2. Step 2: Convert to fraction form
    893.36/1,231.68 = 644.48/x
  3. Step 3: Cross multiply
    893.36x = 1,231.68 × 644.48
  4. Step 4: Simplify right side
    893.36x = 793,793.13
  5. Step 5: Solve for x
    x = 793,793.13/893.36
  6. Step 6: Final answer
    x = 888.55

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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.