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Finding the Fourth Proportional to 128,761.80, 192,705.30 and 113,015.40

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Solution

The fourth proportional to 128,761.80, 192,705.30 and 113,015.40 is: 169,139.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,761.80 : 192,705.30 = 113,015.40 : x
  2. Step 2: Convert to fraction form
    128,761.80/192,705.30 = 113,015.40/x
  3. Step 3: Cross multiply
    128,761.80x = 192,705.30 × 113,015.40
  4. Step 4: Simplify right side
    128,761.80x = 21,778,666,561.62
  5. Step 5: Solve for x
    x = 21,778,666,561.62/128,761.80
  6. Step 6: Final answer
    x = 169,139.19

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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.