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Finding the Fourth Proportional to 822.18, 1,134.47 and 490.56

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Solution

The fourth proportional to 822.18, 1,134.47 and 490.56 is: 676.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.18 : 1,134.47 = 490.56 : x
  2. Step 2: Convert to fraction form
    822.18/1,134.47 = 490.56/x
  3. Step 3: Cross multiply
    822.18x = 1,134.47 × 490.56
  4. Step 4: Simplify right side
    822.18x = 556,525.60
  5. Step 5: Solve for x
    x = 556,525.60/822.18
  6. Step 6: Final answer
    x = 676.89

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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.