Home / 428,315.86-642,764.40-228,779.56

Finding the Fourth Proportional to 428,315.86, 642,764.40 and 228,779.56

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Solution

The fourth proportional to 428,315.86, 642,764.40 and 228,779.56 is: 343,324.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,315.86 : 642,764.40 = 228,779.56 : x
  2. Step 2: Convert to fraction form
    428,315.86/642,764.40 = 228,779.56/x
  3. Step 3: Cross multiply
    428,315.86x = 642,764.40 × 228,779.56
  4. Step 4: Simplify right side
    428,315.86x = 147,051,356,615.66
  5. Step 5: Solve for x
    x = 147,051,356,615.66/428,315.86
  6. Step 6: Final answer
    x = 343,324.57

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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.