Home / 12,135.75-18,208-4,239.42

Finding the Fourth Proportional to 12,135.75, 18,208 and 4,239.42

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Solution

The fourth proportional to 12,135.75, 18,208 and 4,239.42 is: 6,360.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,135.75 : 18,208 = 4,239.42 : x
  2. Step 2: Convert to fraction form
    12,135.75/18,208 = 4,239.42/x
  3. Step 3: Cross multiply
    12,135.75x = 18,208 × 4,239.42
  4. Step 4: Simplify right side
    12,135.75x = 77,191,359.36
  5. Step 5: Solve for x
    x = 77,191,359.36/12,135.75
  6. Step 6: Final answer
    x = 6,360.66

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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.