Home / 128,064.35-191,620.76-80,456.54

Finding the Fourth Proportional to 128,064.35, 191,620.76 and 80,456.54

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Solution

The fourth proportional to 128,064.35, 191,620.76 and 80,456.54 is: 120,385.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,064.35 : 191,620.76 = 80,456.54 : x
  2. Step 2: Convert to fraction form
    128,064.35/191,620.76 = 80,456.54/x
  3. Step 3: Cross multiply
    128,064.35x = 191,620.76 × 80,456.54
  4. Step 4: Simplify right side
    128,064.35x = 15,417,141,981.38
  5. Step 5: Solve for x
    x = 15,417,141,981.38/128,064.35
  6. Step 6: Final answer
    x = 120,385.90

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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.