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Finding the Fourth Proportional to 1,021.82, 1,409.28 and 628.70

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Solution

The fourth proportional to 1,021.82, 1,409.28 and 628.70 is: 867.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.82 : 1,409.28 = 628.70 : x
  2. Step 2: Convert to fraction form
    1,021.82/1,409.28 = 628.70/x
  3. Step 3: Cross multiply
    1,021.82x = 1,409.28 × 628.70
  4. Step 4: Simplify right side
    1,021.82x = 886,014.34
  5. Step 5: Solve for x
    x = 886,014.34/1,021.82
  6. Step 6: Final answer
    x = 867.09

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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.