Home / 13,239.45-18,218.12-12,220.47

Finding the Fourth Proportional to 13,239.45, 18,218.12 and 12,220.47

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Solution

The fourth proportional to 13,239.45, 18,218.12 and 12,220.47 is: 16,815.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,239.45 : 18,218.12 = 12,220.47 : x
  2. Step 2: Convert to fraction form
    13,239.45/18,218.12 = 12,220.47/x
  3. Step 3: Cross multiply
    13,239.45x = 18,218.12 × 12,220.47
  4. Step 4: Simplify right side
    13,239.45x = 222,633,927.81
  5. Step 5: Solve for x
    x = 222,633,927.81/13,239.45
  6. Step 6: Final answer
    x = 16,815.95

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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.