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Finding the Fourth Proportional to 823.95, 1,136.89 and 487.90

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Solution

The fourth proportional to 823.95, 1,136.89 and 487.90 is: 673.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.95 : 1,136.89 = 487.90 : x
  2. Step 2: Convert to fraction form
    823.95/1,136.89 = 487.90/x
  3. Step 3: Cross multiply
    823.95x = 1,136.89 × 487.90
  4. Step 4: Simplify right side
    823.95x = 554,690.66
  5. Step 5: Solve for x
    x = 554,690.66/823.95
  6. Step 6: Final answer
    x = 673.21

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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.