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Finding the Fourth Proportional to 2,838.32, 4,257.72 and 890

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Solution

The fourth proportional to 2,838.32, 4,257.72 and 890 is: 1,335.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,838.32 : 4,257.72 = 890 : x
  2. Step 2: Convert to fraction form
    2,838.32/4,257.72 = 890/x
  3. Step 3: Cross multiply
    2,838.32x = 4,257.72 × 890
  4. Step 4: Simplify right side
    2,838.32x = 3,789,370.80
  5. Step 5: Solve for x
    x = 3,789,370.80/2,838.32
  6. Step 6: Final answer
    x = 1,335.08

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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.