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Finding the Fourth Proportional to 1,442.56, 1,989.52 and 1,222

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Solution

The fourth proportional to 1,442.56, 1,989.52 and 1,222 is: 1,685.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,442.56 : 1,989.52 = 1,222 : x
  2. Step 2: Convert to fraction form
    1,442.56/1,989.52 = 1,222/x
  3. Step 3: Cross multiply
    1,442.56x = 1,989.52 × 1,222
  4. Step 4: Simplify right side
    1,442.56x = 2,431,193.44
  5. Step 5: Solve for x
    x = 2,431,193.44/1,442.56
  6. Step 6: Final answer
    x = 1,685.33

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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.