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Finding the Fourth Proportional to 128,842.40, 193,359.60 and 66,480.80

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Solution

The fourth proportional to 128,842.40, 193,359.60 and 66,480.80 is: 99,770.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,842.40 : 193,359.60 = 66,480.80 : x
  2. Step 2: Convert to fraction form
    128,842.40/193,359.60 = 66,480.80/x
  3. Step 3: Cross multiply
    128,842.40x = 193,359.60 × 66,480.80
  4. Step 4: Simplify right side
    128,842.40x = 12,854,700,895.68
  5. Step 5: Solve for x
    x = 12,854,700,895.68/128,842.40
  6. Step 6: Final answer
    x = 99,770.73

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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.