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Finding the Fourth Proportional to 823.40, 1,135.38 and 561.56

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Solution

The fourth proportional to 823.40, 1,135.38 and 561.56 is: 774.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.40 : 1,135.38 = 561.56 : x
  2. Step 2: Convert to fraction form
    823.40/1,135.38 = 561.56/x
  3. Step 3: Cross multiply
    823.40x = 1,135.38 × 561.56
  4. Step 4: Simplify right side
    823.40x = 637,583.99
  5. Step 5: Solve for x
    x = 637,583.99/823.40
  6. Step 6: Final answer
    x = 774.33

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1.5x scale

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.