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Finding the Fourth Proportional to 12,855.25, 17,739.53 and 7,190.22

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Solution

The fourth proportional to 12,855.25, 17,739.53 and 7,190.22 is: 9,922.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,855.25 : 17,739.53 = 7,190.22 : x
  2. Step 2: Convert to fraction form
    12,855.25/17,739.53 = 7,190.22/x
  3. Step 3: Cross multiply
    12,855.25x = 17,739.53 × 7,190.22
  4. Step 4: Simplify right side
    12,855.25x = 127,551,123.40
  5. Step 5: Solve for x
    x = 127,551,123.40/12,855.25
  6. Step 6: Final answer
    x = 9,922.11

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1.5x scale

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.