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Finding the Fourth Proportional to 128,901.78, 193,418.28 and 58,771.98

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Solution

The fourth proportional to 128,901.78, 193,418.28 and 58,771.98 is: 88,187.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,901.78 : 193,418.28 = 58,771.98 : x
  2. Step 2: Convert to fraction form
    128,901.78/193,418.28 = 58,771.98/x
  3. Step 3: Cross multiply
    128,901.78x = 193,418.28 × 58,771.98
  4. Step 4: Simplify right side
    128,901.78x = 11,367,575,283.79
  5. Step 5: Solve for x
    x = 11,367,575,283.79/128,901.78
  6. Step 6: Final answer
    x = 88,187.88

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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.