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Finding the Fourth Proportional to 128,432.56, 192,661.80 and 48,450.46

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Solution

The fourth proportional to 128,432.56, 192,661.80 and 48,450.46 is: 72,680.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,432.56 : 192,661.80 = 48,450.46 : x
  2. Step 2: Convert to fraction form
    128,432.56/192,661.80 = 48,450.46/x
  3. Step 3: Cross multiply
    128,432.56x = 192,661.80 × 48,450.46
  4. Step 4: Simplify right side
    128,432.56x = 9,334,552,834.43
  5. Step 5: Solve for x
    x = 9,334,552,834.43/128,432.56
  6. Step 6: Final answer
    x = 72,680.58

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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.