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Finding the Fourth Proportional to 1,085.54, 1,628.28 and 263.81

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Solution

The fourth proportional to 1,085.54, 1,628.28 and 263.81 is: 395.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,085.54 : 1,628.28 = 263.81 : x
  2. Step 2: Convert to fraction form
    1,085.54/1,628.28 = 263.81/x
  3. Step 3: Cross multiply
    1,085.54x = 1,628.28 × 263.81
  4. Step 4: Simplify right side
    1,085.54x = 429,556.55
  5. Step 5: Solve for x
    x = 429,556.55/1,085.54
  6. Step 6: Final answer
    x = 395.71

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.