Home / 20,109.86-30,145.35-7,621.28

Finding the Fourth Proportional to 20,109.86, 30,145.35 and 7,621.28

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Solution

The fourth proportional to 20,109.86, 30,145.35 and 7,621.28 is: 11,424.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,109.86 : 30,145.35 = 7,621.28 : x
  2. Step 2: Convert to fraction form
    20,109.86/30,145.35 = 7,621.28/x
  3. Step 3: Cross multiply
    20,109.86x = 30,145.35 × 7,621.28
  4. Step 4: Simplify right side
    20,109.86x = 229,746,153.05
  5. Step 5: Solve for x
    x = 229,746,153.05/20,109.86
  6. Step 6: Final answer
    x = 11,424.55

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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.