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Finding the Fourth Proportional to 128,699.14, 192,835.35 and 91,072.78

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Solution

The fourth proportional to 128,699.14, 192,835.35 and 91,072.78 is: 136,458.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,699.14 : 192,835.35 = 91,072.78 : x
  2. Step 2: Convert to fraction form
    128,699.14/192,835.35 = 91,072.78/x
  3. Step 3: Cross multiply
    128,699.14x = 192,835.35 × 91,072.78
  4. Step 4: Simplify right side
    128,699.14x = 17,562,051,406.77
  5. Step 5: Solve for x
    x = 17,562,051,406.77/128,699.14
  6. Step 6: Final answer
    x = 136,458.19

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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.