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Finding the Fourth Proportional to 120,489.60, 180,604.80 and 45,580.80

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Solution

The fourth proportional to 120,489.60, 180,604.80 and 45,580.80 is: 68,322.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,489.60 : 180,604.80 = 45,580.80 : x
  2. Step 2: Convert to fraction form
    120,489.60/180,604.80 = 45,580.80/x
  3. Step 3: Cross multiply
    120,489.60x = 180,604.80 × 45,580.80
  4. Step 4: Simplify right side
    120,489.60x = 8,232,111,267.84
  5. Step 5: Solve for x
    x = 8,232,111,267.84/120,489.60
  6. Step 6: Final answer
    x = 68,322.17

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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.