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Finding the Fourth Proportional to 1,580.78, 2,181.04 and 1,021.28

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Solution

The fourth proportional to 1,580.78, 2,181.04 and 1,021.28 is: 1,409.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,580.78 : 2,181.04 = 1,021.28 : x
  2. Step 2: Convert to fraction form
    1,580.78/2,181.04 = 1,021.28/x
  3. Step 3: Cross multiply
    1,580.78x = 2,181.04 × 1,021.28
  4. Step 4: Simplify right side
    1,580.78x = 2,227,439.07
  5. Step 5: Solve for x
    x = 2,227,439.07/1,580.78
  6. Step 6: Final answer
    x = 1,409.07

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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.