Home / 428,308.12-642,403.85-112,738.60

Finding the Fourth Proportional to 428,308.12, 642,403.85 and 112,738.60

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Solution

The fourth proportional to 428,308.12, 642,403.85 and 112,738.60 is: 169,092.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,308.12 : 642,403.85 = 112,738.60 : x
  2. Step 2: Convert to fraction form
    428,308.12/642,403.85 = 112,738.60/x
  3. Step 3: Cross multiply
    428,308.12x = 642,403.85 × 112,738.60
  4. Step 4: Simplify right side
    428,308.12x = 72,423,707,471.59
  5. Step 5: Solve for x
    x = 72,423,707,471.59/428,308.12
  6. Step 6: Final answer
    x = 169,092.54

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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.