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Finding the Fourth Proportional to 128,939.40, 193,292.46 and 45,813.96

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Solution

The fourth proportional to 128,939.40, 193,292.46 and 45,813.96 is: 68,679.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,939.40 : 193,292.46 = 45,813.96 : x
  2. Step 2: Convert to fraction form
    128,939.40/193,292.46 = 45,813.96/x
  3. Step 3: Cross multiply
    128,939.40x = 193,292.46 × 45,813.96
  4. Step 4: Simplify right side
    128,939.40x = 8,855,493,030.74
  5. Step 5: Solve for x
    x = 8,855,493,030.74/128,939.40
  6. Step 6: Final answer
    x = 68,679.50

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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.