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Finding the Fourth Proportional to 1,578.99, 2,179.27 and 1,021.11

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Solution

The fourth proportional to 1,578.99, 2,179.27 and 1,021.11 is: 1,409.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,578.99 : 2,179.27 = 1,021.11 : x
  2. Step 2: Convert to fraction form
    1,578.99/2,179.27 = 1,021.11/x
  3. Step 3: Cross multiply
    1,578.99x = 2,179.27 × 1,021.11
  4. Step 4: Simplify right side
    1,578.99x = 2,225,274.39
  5. Step 5: Solve for x
    x = 2,225,274.39/1,578.99
  6. Step 6: Final answer
    x = 1,409.30

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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.