Home / 20,107.86-30,142.35-7,619.28

Finding the Fourth Proportional to 20,107.86, 30,142.35 and 7,619.28

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Solution

The fourth proportional to 20,107.86, 30,142.35 and 7,619.28 is: 11,421.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,107.86 : 30,142.35 = 7,619.28 : x
  2. Step 2: Convert to fraction form
    20,107.86/30,142.35 = 7,619.28/x
  3. Step 3: Cross multiply
    20,107.86x = 30,142.35 × 7,619.28
  4. Step 4: Simplify right side
    20,107.86x = 229,663,004.51
  5. Step 5: Solve for x
    x = 229,663,004.51/20,107.86
  6. Step 6: Final answer
    x = 11,421.55

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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.