Home / 18,012.12-26,989.02-13,638.12

Finding the Fourth Proportional to 18,012.12, 26,989.02 and 13,638.12

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Solution

The fourth proportional to 18,012.12, 26,989.02 and 13,638.12 is: 20,435.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,012.12 : 26,989.02 = 13,638.12 : x
  2. Step 2: Convert to fraction form
    18,012.12/26,989.02 = 13,638.12/x
  3. Step 3: Cross multiply
    18,012.12x = 26,989.02 × 13,638.12
  4. Step 4: Simplify right side
    18,012.12x = 368,079,493.44
  5. Step 5: Solve for x
    x = 368,079,493.44/18,012.12
  6. Step 6: Final answer
    x = 20,435.10

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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.