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Finding the Fourth Proportional to 128,894.90, 193,351.56 and 53,939.58

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Solution

The fourth proportional to 128,894.90, 193,351.56 and 53,939.58 is: 80,913.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,894.90 : 193,351.56 = 53,939.58 : x
  2. Step 2: Convert to fraction form
    128,894.90/193,351.56 = 53,939.58/x
  3. Step 3: Cross multiply
    128,894.90x = 193,351.56 × 53,939.58
  4. Step 4: Simplify right side
    128,894.90x = 10,429,301,938.74
  5. Step 5: Solve for x
    x = 10,429,301,938.74/128,894.90
  6. Step 6: Final answer
    x = 80,913.22

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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.