Home / 428,356.80-642,566.88-128,813.04

Finding the Fourth Proportional to 428,356.80, 642,566.88 and 128,813.04

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Solution

The fourth proportional to 428,356.80, 642,566.88 and 128,813.04 is: 193,229.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,356.80 : 642,566.88 = 128,813.04 : x
  2. Step 2: Convert to fraction form
    428,356.80/642,566.88 = 128,813.04/x
  3. Step 3: Cross multiply
    428,356.80x = 642,566.88 × 128,813.04
  4. Step 4: Simplify right side
    428,356.80x = 82,770,993,216.12
  5. Step 5: Solve for x
    x = 82,770,993,216.12/428,356.80
  6. Step 6: Final answer
    x = 193,229.09

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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.