Home / 428,213.92-642,719.40-218,009.20

Finding the Fourth Proportional to 428,213.92, 642,719.40 and 218,009.20

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Solution

The fourth proportional to 428,213.92, 642,719.40 and 218,009.20 is: 327,216.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,213.92 : 642,719.40 = 218,009.20 : x
  2. Step 2: Convert to fraction form
    428,213.92/642,719.40 = 218,009.20/x
  3. Step 3: Cross multiply
    428,213.92x = 642,719.40 × 218,009.20
  4. Step 4: Simplify right side
    428,213.92x = 140,118,740,611.68
  5. Step 5: Solve for x
    x = 140,118,740,611.68/428,213.92
  6. Step 6: Final answer
    x = 327,216.69

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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.