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Finding the Fourth Proportional to 428,028, 639,231.18 and 343,915.92

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Solution

The fourth proportional to 428,028, 639,231.18 and 343,915.92 is: 513,615.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,028 : 639,231.18 = 343,915.92 : x
  2. Step 2: Convert to fraction form
    428,028/639,231.18 = 343,915.92/x
  3. Step 3: Cross multiply
    428,028x = 639,231.18 × 343,915.92
  4. Step 4: Simplify right side
    428,028x = 219,841,779,362.39
  5. Step 5: Solve for x
    x = 219,841,779,362.39/428,028
  6. Step 6: Final answer
    x = 513,615.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.