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Finding the Fourth Proportional to 128,121, 191,940.93 and 118,454.46

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Solution

The fourth proportional to 128,121, 191,940.93 and 118,454.46 is: 177,459.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,121 : 191,940.93 = 118,454.46 : x
  2. Step 2: Convert to fraction form
    128,121/191,940.93 = 118,454.46/x
  3. Step 3: Cross multiply
    128,121x = 191,940.93 × 118,454.46
  4. Step 4: Simplify right side
    128,121x = 22,736,259,215.05
  5. Step 5: Solve for x
    x = 22,736,259,215.05/128,121
  6. Step 6: Final answer
    x = 177,459.27

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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.