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Finding the Fourth Proportional to 220,608, 331,021.36 and 87,485.30

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Solution

The fourth proportional to 220,608, 331,021.36 and 87,485.30 is: 131,271.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    220,608 : 331,021.36 = 87,485.30 : x
  2. Step 2: Convert to fraction form
    220,608/331,021.36 = 87,485.30/x
  3. Step 3: Cross multiply
    220,608x = 331,021.36 × 87,485.30
  4. Step 4: Simplify right side
    220,608x = 28,959,502,986.01
  5. Step 5: Solve for x
    x = 28,959,502,986.01/220,608
  6. Step 6: Final answer
    x = 131,271.32

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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.