Home / 428,128.86-642,194.82-143,811.30

Finding the Fourth Proportional to 428,128.86, 642,194.82 and 143,811.30

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Solution

The fourth proportional to 428,128.86, 642,194.82 and 143,811.30 is: 215,717.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,128.86 : 642,194.82 = 143,811.30 : x
  2. Step 2: Convert to fraction form
    428,128.86/642,194.82 = 143,811.30/x
  3. Step 3: Cross multiply
    428,128.86x = 642,194.82 × 143,811.30
  4. Step 4: Simplify right side
    428,128.86x = 92,354,871,917.47
  5. Step 5: Solve for x
    x = 92,354,871,917.47/428,128.86
  6. Step 6: Final answer
    x = 215,717.46

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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.