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Finding the Fourth Proportional to 427,218.80, 640,828.20 and 111,707.60

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Solution

The fourth proportional to 427,218.80, 640,828.20 and 111,707.60 is: 167,561.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,218.80 : 640,828.20 = 111,707.60 : x
  2. Step 2: Convert to fraction form
    427,218.80/640,828.20 = 111,707.60/x
  3. Step 3: Cross multiply
    427,218.80x = 640,828.20 × 111,707.60
  4. Step 4: Simplify right side
    427,218.80x = 71,585,380,234.32
  5. Step 5: Solve for x
    x = 71,585,380,234.32/427,218.80
  6. Step 6: Final answer
    x = 167,561.40

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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.