Home / 21,815.36-30,104.16-12,382.64

Finding the Fourth Proportional to 21,815.36, 30,104.16 and 12,382.64

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Solution

The fourth proportional to 21,815.36, 30,104.16 and 12,382.64 is: 17,087.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,815.36 : 30,104.16 = 12,382.64 : x
  2. Step 2: Convert to fraction form
    21,815.36/30,104.16 = 12,382.64/x
  3. Step 3: Cross multiply
    21,815.36x = 30,104.16 × 12,382.64
  4. Step 4: Simplify right side
    21,815.36x = 372,768,975.78
  5. Step 5: Solve for x
    x = 372,768,975.78/21,815.36
  6. Step 6: Final answer
    x = 17,087.45

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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.