Home / 12,489.80-18,643.58-10,913.36

Finding the Fourth Proportional to 12,489.80, 18,643.58 and 10,913.36

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Solution

The fourth proportional to 12,489.80, 18,643.58 and 10,913.36 is: 16,290.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.80 : 18,643.58 = 10,913.36 : x
  2. Step 2: Convert to fraction form
    12,489.80/18,643.58 = 10,913.36/x
  3. Step 3: Cross multiply
    12,489.80x = 18,643.58 × 10,913.36
  4. Step 4: Simplify right side
    12,489.80x = 203,463,993.37
  5. Step 5: Solve for x
    x = 203,463,993.37/12,489.80
  6. Step 6: Final answer
    x = 16,290.42

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.