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Finding the Fourth Proportional to 821.66, 1,133.97 and 490.19

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Solution

The fourth proportional to 821.66, 1,133.97 and 490.19 is: 676.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.66 : 1,133.97 = 490.19 : x
  2. Step 2: Convert to fraction form
    821.66/1,133.97 = 490.19/x
  3. Step 3: Cross multiply
    821.66x = 1,133.97 × 490.19
  4. Step 4: Simplify right side
    821.66x = 555,860.75
  5. Step 5: Solve for x
    x = 555,860.75/821.66
  6. Step 6: Final answer
    x = 676.51

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Double scale
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1.5x scale

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.