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Finding the Fourth Proportional to 876.45, 1,314.60 and 321.16

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Solution

The fourth proportional to 876.45, 1,314.60 and 321.16 is: 481.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.45 : 1,314.60 = 321.16 : x
  2. Step 2: Convert to fraction form
    876.45/1,314.60 = 321.16/x
  3. Step 3: Cross multiply
    876.45x = 1,314.60 × 321.16
  4. Step 4: Simplify right side
    876.45x = 422,201.65
  5. Step 5: Solve for x
    x = 422,201.65/876.45
  6. Step 6: Final answer
    x = 481.72

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.