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Finding the Fourth Proportional to 824.81, 1,235.99 and 459.09

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Solution

The fourth proportional to 824.81, 1,235.99 and 459.09 is: 687.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.81 : 1,235.99 = 459.09 : x
  2. Step 2: Convert to fraction form
    824.81/1,235.99 = 459.09/x
  3. Step 3: Cross multiply
    824.81x = 1,235.99 × 459.09
  4. Step 4: Simplify right side
    824.81x = 567,428.35
  5. Step 5: Solve for x
    x = 567,428.35/824.81
  6. Step 6: Final answer
    x = 687.95

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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.