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Finding the Fourth Proportional to 823.50, 1,136.63 and 474.39

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Solution

The fourth proportional to 823.50, 1,136.63 and 474.39 is: 654.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.50 : 1,136.63 = 474.39 : x
  2. Step 2: Convert to fraction form
    823.50/1,136.63 = 474.39/x
  3. Step 3: Cross multiply
    823.50x = 1,136.63 × 474.39
  4. Step 4: Simplify right side
    823.50x = 539,207.09
  5. Step 5: Solve for x
    x = 539,207.09/823.50
  6. Step 6: Final answer
    x = 654.77

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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.