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Finding the Fourth Proportional to 2,486.72, 3,728.80 and 842.68

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Solution

The fourth proportional to 2,486.72, 3,728.80 and 842.68 is: 1,263.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,486.72 : 3,728.80 = 842.68 : x
  2. Step 2: Convert to fraction form
    2,486.72/3,728.80 = 842.68/x
  3. Step 3: Cross multiply
    2,486.72x = 3,728.80 × 842.68
  4. Step 4: Simplify right side
    2,486.72x = 3,142,185.18
  5. Step 5: Solve for x
    x = 3,142,185.18/2,486.72
  6. Step 6: Final answer
    x = 1,263.59

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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.