Home / 20,112.20-30,143.10-10,255.40

Finding the Fourth Proportional to 20,112.20, 30,143.10 and 10,255.40

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Solution

The fourth proportional to 20,112.20, 30,143.10 and 10,255.40 is: 15,370.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,112.20 : 30,143.10 = 10,255.40 : x
  2. Step 2: Convert to fraction form
    20,112.20/30,143.10 = 10,255.40/x
  3. Step 3: Cross multiply
    20,112.20x = 30,143.10 × 10,255.40
  4. Step 4: Simplify right side
    20,112.20x = 309,129,547.74
  5. Step 5: Solve for x
    x = 309,129,547.74/20,112.20
  6. Step 6: Final answer
    x = 15,370.25

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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.