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Finding the Fourth Proportional to 5,321.98, 7,980.54 and 1,858.42

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Solution

The fourth proportional to 5,321.98, 7,980.54 and 1,858.42 is: 2,786.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,321.98 : 7,980.54 = 1,858.42 : x
  2. Step 2: Convert to fraction form
    5,321.98/7,980.54 = 1,858.42/x
  3. Step 3: Cross multiply
    5,321.98x = 7,980.54 × 1,858.42
  4. Step 4: Simplify right side
    5,321.98x = 14,831,195.15
  5. Step 5: Solve for x
    x = 14,831,195.15/5,321.98
  6. Step 6: Final answer
    x = 2,786.78

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1.5x scale

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.