Home / 20,129.86-30,180.21-10,140.76

Finding the Fourth Proportional to 20,129.86, 30,180.21 and 10,140.76

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Solution

The fourth proportional to 20,129.86, 30,180.21 and 10,140.76 is: 15,203.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,129.86 : 30,180.21 = 10,140.76 : x
  2. Step 2: Convert to fraction form
    20,129.86/30,180.21 = 10,140.76/x
  3. Step 3: Cross multiply
    20,129.86x = 30,180.21 × 10,140.76
  4. Step 4: Simplify right side
    20,129.86x = 306,050,266.36
  5. Step 5: Solve for x
    x = 306,050,266.36/20,129.86
  6. Step 6: Final answer
    x = 15,203.80

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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.