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Finding the Fourth Proportional to 120,003.20, 180,004.80 and 86,825.60

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Solution

The fourth proportional to 120,003.20, 180,004.80 and 86,825.60 is: 130,238.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,003.20 : 180,004.80 = 86,825.60 : x
  2. Step 2: Convert to fraction form
    120,003.20/180,004.80 = 86,825.60/x
  3. Step 3: Cross multiply
    120,003.20x = 180,004.80 × 86,825.60
  4. Step 4: Simplify right side
    120,003.20x = 15,629,024,762.88
  5. Step 5: Solve for x
    x = 15,629,024,762.88/120,003.20
  6. Step 6: Final answer
    x = 130,238.40

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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.