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Finding the Fourth Proportional to 821.95, 1,134.27 and 490.21

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Solution

The fourth proportional to 821.95, 1,134.27 and 490.21 is: 676.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    821.95 : 1,134.27 = 490.21 : x
  2. Step 2: Convert to fraction form
    821.95/1,134.27 = 490.21/x
  3. Step 3: Cross multiply
    821.95x = 1,134.27 × 490.21
  4. Step 4: Simplify right side
    821.95x = 556,022.37
  5. Step 5: Solve for x
    x = 556,022.37/821.95
  6. Step 6: Final answer
    x = 676.47

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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.