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Finding the Fourth Proportional to 128,939.66, 193,449.08 and 61,557.67

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Solution

The fourth proportional to 128,939.66, 193,449.08 and 61,557.67 is: 92,355.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,939.66 : 193,449.08 = 61,557.67 : x
  2. Step 2: Convert to fraction form
    128,939.66/193,449.08 = 61,557.67/x
  3. Step 3: Cross multiply
    128,939.66x = 193,449.08 × 61,557.67
  4. Step 4: Simplify right side
    128,939.66x = 11,908,274,628.44
  5. Step 5: Solve for x
    x = 11,908,274,628.44/128,939.66
  6. Step 6: Final answer
    x = 92,355.41

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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.