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Finding the Fourth Proportional to 1,580.56, 2,181.24 and 917.56

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Solution

The fourth proportional to 1,580.56, 2,181.24 and 917.56 is: 1,266.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,580.56 : 2,181.24 = 917.56 : x
  2. Step 2: Convert to fraction form
    1,580.56/2,181.24 = 917.56/x
  3. Step 3: Cross multiply
    1,580.56x = 2,181.24 × 917.56
  4. Step 4: Simplify right side
    1,580.56x = 2,001,418.57
  5. Step 5: Solve for x
    x = 2,001,418.57/1,580.56
  6. Step 6: Final answer
    x = 1,266.27

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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.