Home / 12,138.40-18,173.04-8,428.96

Finding the Fourth Proportional to 12,138.40, 18,173.04 and 8,428.96

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Solution

The fourth proportional to 12,138.40, 18,173.04 and 8,428.96 is: 12,619.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.40 : 18,173.04 = 8,428.96 : x
  2. Step 2: Convert to fraction form
    12,138.40/18,173.04 = 8,428.96/x
  3. Step 3: Cross multiply
    12,138.40x = 18,173.04 × 8,428.96
  4. Step 4: Simplify right side
    12,138.40x = 153,179,827.24
  5. Step 5: Solve for x
    x = 153,179,827.24/12,138.40
  6. Step 6: Final answer
    x = 12,619.44

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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.