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Finding the Fourth Proportional to 1,105.88, 1,525.62 and 639.80

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Solution

The fourth proportional to 1,105.88, 1,525.62 and 639.80 is: 882.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.88 : 1,525.62 = 639.80 : x
  2. Step 2: Convert to fraction form
    1,105.88/1,525.62 = 639.80/x
  3. Step 3: Cross multiply
    1,105.88x = 1,525.62 × 639.80
  4. Step 4: Simplify right side
    1,105.88x = 976,091.68
  5. Step 5: Solve for x
    x = 976,091.68/1,105.88
  6. Step 6: Final answer
    x = 882.64

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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.