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Finding the Fourth Proportional to 822.79, 1,233.40 and 274.59

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Solution

The fourth proportional to 822.79, 1,233.40 and 274.59 is: 411.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    822.79 : 1,233.40 = 274.59 : x
  2. Step 2: Convert to fraction form
    822.79/1,233.40 = 274.59/x
  3. Step 3: Cross multiply
    822.79x = 1,233.40 × 274.59
  4. Step 4: Simplify right side
    822.79x = 338,679.31
  5. Step 5: Solve for x
    x = 338,679.31/822.79
  6. Step 6: Final answer
    x = 411.62

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.