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Finding the Fourth Proportional to 801.63, 1,107.68 and 628.29

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Solution

The fourth proportional to 801.63, 1,107.68 and 628.29 is: 868.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    801.63 : 1,107.68 = 628.29 : x
  2. Step 2: Convert to fraction form
    801.63/1,107.68 = 628.29/x
  3. Step 3: Cross multiply
    801.63x = 1,107.68 × 628.29
  4. Step 4: Simplify right side
    801.63x = 695,941.13
  5. Step 5: Solve for x
    x = 695,941.13/801.63
  6. Step 6: Final answer
    x = 868.16

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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.