Home / 128,848.60-192,981.30-81,609.40

Finding the Fourth Proportional to 128,848.60, 192,981.30 and 81,609.40

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Solution

The fourth proportional to 128,848.60, 192,981.30 and 81,609.40 is: 122,229.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,848.60 : 192,981.30 = 81,609.40 : x
  2. Step 2: Convert to fraction form
    128,848.60/192,981.30 = 81,609.40/x
  3. Step 3: Cross multiply
    128,848.60x = 192,981.30 × 81,609.40
  4. Step 4: Simplify right side
    128,848.60x = 15,749,088,104.22
  5. Step 5: Solve for x
    x = 15,749,088,104.22/128,848.60
  6. Step 6: Final answer
    x = 122,229.41

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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.