Home / 21,815.58-30,104.70-13,331.90

Finding the Fourth Proportional to 21,815.58, 30,104.70 and 13,331.90

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Solution

The fourth proportional to 21,815.58, 30,104.70 and 13,331.90 is: 18,397.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,815.58 : 30,104.70 = 13,331.90 : x
  2. Step 2: Convert to fraction form
    21,815.58/30,104.70 = 13,331.90/x
  3. Step 3: Cross multiply
    21,815.58x = 30,104.70 × 13,331.90
  4. Step 4: Simplify right side
    21,815.58x = 401,352,632.75
  5. Step 5: Solve for x
    x = 401,352,632.75/21,815.58
  6. Step 6: Final answer
    x = 18,397.52

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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.