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Finding the Fourth Proportional to 428,121.72, 642,131.46 and 112,603.23

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Solution

The fourth proportional to 428,121.72, 642,131.46 and 112,603.23 is: 168,891.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,121.72 : 642,131.46 = 112,603.23 : x
  2. Step 2: Convert to fraction form
    428,121.72/642,131.46 = 112,603.23/x
  3. Step 3: Cross multiply
    428,121.72x = 642,131.46 × 112,603.23
  4. Step 4: Simplify right side
    428,121.72x = 72,306,076,480.62
  5. Step 5: Solve for x
    x = 72,306,076,480.62/428,121.72
  6. Step 6: Final answer
    x = 168,891.40

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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.