Home / 13,638.12-18,814.23-8,857.68

Finding the Fourth Proportional to 13,638.12, 18,814.23 and 8,857.68

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Solution

The fourth proportional to 13,638.12, 18,814.23 and 8,857.68 is: 12,219.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,638.12 : 18,814.23 = 8,857.68 : x
  2. Step 2: Convert to fraction form
    13,638.12/18,814.23 = 8,857.68/x
  3. Step 3: Cross multiply
    13,638.12x = 18,814.23 × 8,857.68
  4. Step 4: Simplify right side
    13,638.12x = 166,650,428.79
  5. Step 5: Solve for x
    x = 166,650,428.79/13,638.12
  6. Step 6: Final answer
    x = 12,219.46

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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.