Home / 428,635.20-642,709.80-162,404.40

Finding the Fourth Proportional to 428,635.20, 642,709.80 and 162,404.40

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Solution

The fourth proportional to 428,635.20, 642,709.80 and 162,404.40 is: 243,514.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,635.20 : 642,709.80 = 162,404.40 : x
  2. Step 2: Convert to fraction form
    428,635.20/642,709.80 = 162,404.40/x
  3. Step 3: Cross multiply
    428,635.20x = 642,709.80 × 162,404.40
  4. Step 4: Simplify right side
    428,635.20x = 104,378,899,443.12
  5. Step 5: Solve for x
    x = 104,378,899,443.12/428,635.20
  6. Step 6: Final answer
    x = 243,514.53

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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.