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Finding the Fourth Proportional to 824.09, 1,136.81 and 492.28

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Solution

The fourth proportional to 824.09, 1,136.81 and 492.28 is: 679.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    824.09 : 1,136.81 = 492.28 : x
  2. Step 2: Convert to fraction form
    824.09/1,136.81 = 492.28/x
  3. Step 3: Cross multiply
    824.09x = 1,136.81 × 492.28
  4. Step 4: Simplify right side
    824.09x = 559,627.22
  5. Step 5: Solve for x
    x = 559,627.22/824.09
  6. Step 6: Final answer
    x = 679.09

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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.