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Finding the Fourth Proportional to 821.75, 1,134 and 490.25

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Solution

The fourth proportional to 821.75, 1,134 and 490.25 is: 676.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.75 : 1,134 = 490.25 : x
  2. Step 2: Convert to fraction form
    821.75/1,134 = 490.25/x
  3. Step 3: Cross multiply
    821.75x = 1,134 × 490.25
  4. Step 4: Simplify right side
    821.75x = 555,946.34
  5. Step 5: Solve for x
    x = 555,946.34/821.75
  6. Step 6: Final answer
    x = 676.54

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Double scale
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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.