Home / 12,138.98-18,208.59-3,818.81

Finding the Fourth Proportional to 12,138.98, 18,208.59 and 3,818.81

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Solution

The fourth proportional to 12,138.98, 18,208.59 and 3,818.81 is: 5,728.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,138.98 : 18,208.59 = 3,818.81 : x
  2. Step 2: Convert to fraction form
    12,138.98/18,208.59 = 3,818.81/x
  3. Step 3: Cross multiply
    12,138.98x = 18,208.59 × 3,818.81
  4. Step 4: Simplify right side
    12,138.98x = 69,535,145.58
  5. Step 5: Solve for x
    x = 69,535,145.58/12,138.98
  6. Step 6: Final answer
    x = 5,728.25

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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.