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Finding the Fourth Proportional to 128,660.80, 192,904.80 and 68,699.20

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Solution

The fourth proportional to 128,660.80, 192,904.80 and 68,699.20 is: 103,002.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,660.80 : 192,904.80 = 68,699.20 : x
  2. Step 2: Convert to fraction form
    128,660.80/192,904.80 = 68,699.20/x
  3. Step 3: Cross multiply
    128,660.80x = 192,904.80 × 68,699.20
  4. Step 4: Simplify right side
    128,660.80x = 13,252,405,436.16
  5. Step 5: Solve for x
    x = 13,252,405,436.16/128,660.80
  6. Step 6: Final answer
    x = 103,002.67

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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.