Home / 428,108.76-642,198.78-143,785.80

Finding the Fourth Proportional to 428,108.76, 642,198.78 and 143,785.80

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Solution

The fourth proportional to 428,108.76, 642,198.78 and 143,785.80 is: 215,690.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,108.76 : 642,198.78 = 143,785.80 : x
  2. Step 2: Convert to fraction form
    428,108.76/642,198.78 = 143,785.80/x
  3. Step 3: Cross multiply
    428,108.76x = 642,198.78 × 143,785.80
  4. Step 4: Simplify right side
    428,108.76x = 92,339,065,341.32
  5. Step 5: Solve for x
    x = 92,339,065,341.32/428,108.76
  6. Step 6: Final answer
    x = 215,690.67

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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.