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Finding the Fourth Proportional to 1,021.47, 1,409.49 and 628.44

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Solution

The fourth proportional to 1,021.47, 1,409.49 and 628.44 is: 867.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.47 : 1,409.49 = 628.44 : x
  2. Step 2: Convert to fraction form
    1,021.47/1,409.49 = 628.44/x
  3. Step 3: Cross multiply
    1,021.47x = 1,409.49 × 628.44
  4. Step 4: Simplify right side
    1,021.47x = 885,779.90
  5. Step 5: Solve for x
    x = 885,779.90/1,021.47
  6. Step 6: Final answer
    x = 867.16

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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.