Home / 128,002.12-192,138.48-71,890.18

Finding the Fourth Proportional to 128,002.12, 192,138.48 and 71,890.18

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Solution

The fourth proportional to 128,002.12, 192,138.48 and 71,890.18 is: 107,911.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,002.12 : 192,138.48 = 71,890.18 : x
  2. Step 2: Convert to fraction form
    128,002.12/192,138.48 = 71,890.18/x
  3. Step 3: Cross multiply
    128,002.12x = 192,138.48 × 71,890.18
  4. Step 4: Simplify right side
    128,002.12x = 13,812,869,912.13
  5. Step 5: Solve for x
    x = 13,812,869,912.13/128,002.12
  6. Step 6: Final answer
    x = 107,911.26

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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.