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Finding the Fourth Proportional to 128,896.66, 177,898.76 and 75,181.67

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Solution

The fourth proportional to 128,896.66, 177,898.76 and 75,181.67 is: 103,763.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,896.66 : 177,898.76 = 75,181.67 : x
  2. Step 2: Convert to fraction form
    128,896.66/177,898.76 = 75,181.67/x
  3. Step 3: Cross multiply
    128,896.66x = 177,898.76 × 75,181.67
  4. Step 4: Simplify right side
    128,896.66x = 13,374,726,500.43
  5. Step 5: Solve for x
    x = 13,374,726,500.43/128,896.66
  6. Step 6: Final answer
    x = 103,763.18

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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.