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Finding the Fourth Proportional to 1,580.60, 2,181.22 and 872.45

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Solution

The fourth proportional to 1,580.60, 2,181.22 and 872.45 is: 1,203.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,580.60 : 2,181.22 = 872.45 : x
  2. Step 2: Convert to fraction form
    1,580.60/2,181.22 = 872.45/x
  3. Step 3: Cross multiply
    1,580.60x = 2,181.22 × 872.45
  4. Step 4: Simplify right side
    1,580.60x = 1,903,004.78
  5. Step 5: Solve for x
    x = 1,903,004.78/1,580.60
  6. Step 6: Final answer
    x = 1,203.97

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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.