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Finding the Fourth Proportional to 817.98, 1,128.24 and 683.01

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Solution

The fourth proportional to 817.98, 1,128.24 and 683.01 is: 942.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    817.98 : 1,128.24 = 683.01 : x
  2. Step 2: Convert to fraction form
    817.98/1,128.24 = 683.01/x
  3. Step 3: Cross multiply
    817.98x = 1,128.24 × 683.01
  4. Step 4: Simplify right side
    817.98x = 770,599.20
  5. Step 5: Solve for x
    x = 770,599.20/817.98
  6. Step 6: Final answer
    x = 942.08

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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.