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Finding the Fourth Proportional to 1,122.26, 1,548.63 and 643.73

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Solution

The fourth proportional to 1,122.26, 1,548.63 and 643.73 is: 888.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,122.26 : 1,548.63 = 643.73 : x
  2. Step 2: Convert to fraction form
    1,122.26/1,548.63 = 643.73/x
  3. Step 3: Cross multiply
    1,122.26x = 1,548.63 × 643.73
  4. Step 4: Simplify right side
    1,122.26x = 996,888.63
  5. Step 5: Solve for x
    x = 996,888.63/1,122.26
  6. Step 6: Final answer
    x = 888.29

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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.