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Finding the Fourth Proportional to 1,489.86, 2,052.81 and 1,223.39

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Solution

The fourth proportional to 1,489.86, 2,052.81 and 1,223.39 is: 1,685.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,489.86 : 2,052.81 = 1,223.39 : x
  2. Step 2: Convert to fraction form
    1,489.86/2,052.81 = 1,223.39/x
  3. Step 3: Cross multiply
    1,489.86x = 2,052.81 × 1,223.39
  4. Step 4: Simplify right side
    1,489.86x = 2,511,392.36
  5. Step 5: Solve for x
    x = 2,511,392.36/1,489.86
  6. Step 6: Final answer
    x = 1,685.66

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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.