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Finding the Fourth Proportional to 12,328.40, 18,512.40 and 11,418.80

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Solution

The fourth proportional to 12,328.40, 18,512.40 and 11,418.80 is: 17,146.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,328.40 : 18,512.40 = 11,418.80 : x
  2. Step 2: Convert to fraction form
    12,328.40/18,512.40 = 11,418.80/x
  3. Step 3: Cross multiply
    12,328.40x = 18,512.40 × 11,418.80
  4. Step 4: Simplify right side
    12,328.40x = 211,389,393.12
  5. Step 5: Solve for x
    x = 211,389,393.12/12,328.40
  6. Step 6: Final answer
    x = 17,146.54

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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.