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Finding the Fourth Proportional to 128,940.90, 193,411.35 and 117,860.10

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Solution

The fourth proportional to 128,940.90, 193,411.35 and 117,860.10 is: 176,790.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,940.90 : 193,411.35 = 117,860.10 : x
  2. Step 2: Convert to fraction form
    128,940.90/193,411.35 = 117,860.10/x
  3. Step 3: Cross multiply
    128,940.90x = 193,411.35 × 117,860.10
  4. Step 4: Simplify right side
    128,940.90x = 22,795,481,052.14
  5. Step 5: Solve for x
    x = 22,795,481,052.14/128,940.90
  6. Step 6: Final answer
    x = 176,790.15

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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.