Home / 428,324.80-642,487.20-128,851.60

Finding the Fourth Proportional to 428,324.80, 642,487.20 and 128,851.60

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Solution

The fourth proportional to 428,324.80, 642,487.20 and 128,851.60 is: 193,277.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,324.80 : 642,487.20 = 128,851.60 : x
  2. Step 2: Convert to fraction form
    428,324.80/642,487.20 = 128,851.60/x
  3. Step 3: Cross multiply
    428,324.80x = 642,487.20 × 128,851.60
  4. Step 4: Simplify right side
    428,324.80x = 82,785,503,699.52
  5. Step 5: Solve for x
    x = 82,785,503,699.52/428,324.80
  6. Step 6: Final answer
    x = 193,277.40

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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.