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Finding the Fourth Proportional to 18,012.80, 26,986.80 and 15,420.80

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Solution

The fourth proportional to 18,012.80, 26,986.80 and 15,420.80 is: 23,103.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,012.80 : 26,986.80 = 15,420.80 : x
  2. Step 2: Convert to fraction form
    18,012.80/26,986.80 = 15,420.80/x
  3. Step 3: Cross multiply
    18,012.80x = 26,986.80 × 15,420.80
  4. Step 4: Simplify right side
    18,012.80x = 416,158,045.44
  5. Step 5: Solve for x
    x = 416,158,045.44/18,012.80
  6. Step 6: Final answer
    x = 23,103.46

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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.