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Finding the Fourth Proportional to 213,608.28, 320,444.28 and 78,661.97

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Solution

The fourth proportional to 213,608.28, 320,444.28 and 78,661.97 is: 118,004.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    213,608.28 : 320,444.28 = 78,661.97 : x
  2. Step 2: Convert to fraction form
    213,608.28/320,444.28 = 78,661.97/x
  3. Step 3: Cross multiply
    213,608.28x = 320,444.28 × 78,661.97
  4. Step 4: Simplify right side
    213,608.28x = 25,206,777,946.72
  5. Step 5: Solve for x
    x = 25,206,777,946.72/213,608.28
  6. Step 6: Final answer
    x = 118,004.69

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1.5x scale

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.