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Finding the Fourth Proportional to 1,418.78, 2,128.20 and 552.92

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Solution

The fourth proportional to 1,418.78, 2,128.20 and 552.92 is: 829.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,418.78 : 2,128.20 = 552.92 : x
  2. Step 2: Convert to fraction form
    1,418.78/2,128.20 = 552.92/x
  3. Step 3: Cross multiply
    1,418.78x = 2,128.20 × 552.92
  4. Step 4: Simplify right side
    1,418.78x = 1,176,724.34
  5. Step 5: Solve for x
    x = 1,176,724.34/1,418.78
  6. Step 6: Final answer
    x = 829.39

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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.