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Finding the Fourth Proportional to 2,838.66, 4,257.42 and 989.86

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Solution

The fourth proportional to 2,838.66, 4,257.42 and 989.86 is: 1,484.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,838.66 : 4,257.42 = 989.86 : x
  2. Step 2: Convert to fraction form
    2,838.66/4,257.42 = 989.86/x
  3. Step 3: Cross multiply
    2,838.66x = 4,257.42 × 989.86
  4. Step 4: Simplify right side
    2,838.66x = 4,214,249.76
  5. Step 5: Solve for x
    x = 4,214,249.76/2,838.66
  6. Step 6: Final answer
    x = 1,484.59

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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.