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Finding the Fourth Proportional to 823.55, 1,137.94 and 659.12

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Solution

The fourth proportional to 823.55, 1,137.94 and 659.12 is: 910.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    823.55 : 1,137.94 = 659.12 : x
  2. Step 2: Convert to fraction form
    823.55/1,137.94 = 659.12/x
  3. Step 3: Cross multiply
    823.55x = 1,137.94 × 659.12
  4. Step 4: Simplify right side
    823.55x = 750,039.01
  5. Step 5: Solve for x
    x = 750,039.01/823.55
  6. Step 6: Final answer
    x = 910.74

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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.