Home / 428,460.10-642,780.03-128,962.60

Finding the Fourth Proportional to 428,460.10, 642,780.03 and 128,962.60

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Solution

The fourth proportional to 428,460.10, 642,780.03 and 128,962.60 is: 193,470.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,460.10 : 642,780.03 = 128,962.60 : x
  2. Step 2: Convert to fraction form
    428,460.10/642,780.03 = 128,962.60/x
  3. Step 3: Cross multiply
    428,460.10x = 642,780.03 × 128,962.60
  4. Step 4: Simplify right side
    428,460.10x = 82,894,583,896.88
  5. Step 5: Solve for x
    x = 82,894,583,896.88/428,460.10
  6. Step 6: Final answer
    x = 193,470.95

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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.