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Finding the Fourth Proportional to 823.35, 1,136.19 and 491.70

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Solution

The fourth proportional to 823.35, 1,136.19 and 491.70 is: 678.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.35 : 1,136.19 = 491.70 : x
  2. Step 2: Convert to fraction form
    823.35/1,136.19 = 491.70/x
  3. Step 3: Cross multiply
    823.35x = 1,136.19 × 491.70
  4. Step 4: Simplify right side
    823.35x = 558,664.62
  5. Step 5: Solve for x
    x = 558,664.62/823.35
  6. Step 6: Final answer
    x = 678.53

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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.