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Finding the Fourth Proportional to 1,105.26, 1,525.17 and 639.54

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Solution

The fourth proportional to 1,105.26, 1,525.17 and 639.54 is: 882.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,105.26 : 1,525.17 = 639.54 : x
  2. Step 2: Convert to fraction form
    1,105.26/1,525.17 = 639.54/x
  3. Step 3: Cross multiply
    1,105.26x = 1,525.17 × 639.54
  4. Step 4: Simplify right side
    1,105.26x = 975,407.22
  5. Step 5: Solve for x
    x = 975,407.22/1,105.26
  6. Step 6: Final answer
    x = 882.51

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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.