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Finding the Fourth Proportional to 873.57, 1,205.22 and 579.15

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Solution

The fourth proportional to 873.57, 1,205.22 and 579.15 is: 799.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.57 : 1,205.22 = 579.15 : x
  2. Step 2: Convert to fraction form
    873.57/1,205.22 = 579.15/x
  3. Step 3: Cross multiply
    873.57x = 1,205.22 × 579.15
  4. Step 4: Simplify right side
    873.57x = 698,003.16
  5. Step 5: Solve for x
    x = 698,003.16/873.57
  6. Step 6: Final answer
    x = 799.02

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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.