Home / 128,790.27-177,731.01-72,198

Finding the Fourth Proportional to 128,790.27, 177,731.01 and 72,198

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Solution

The fourth proportional to 128,790.27, 177,731.01 and 72,198 is: 99,633.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,790.27 : 177,731.01 = 72,198 : x
  2. Step 2: Convert to fraction form
    128,790.27/177,731.01 = 72,198/x
  3. Step 3: Cross multiply
    128,790.27x = 177,731.01 × 72,198
  4. Step 4: Simplify right side
    128,790.27x = 12,831,823,459.98
  5. Step 5: Solve for x
    x = 12,831,823,459.98/128,790.27
  6. Step 6: Final answer
    x = 99,633.49

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.