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Finding the Fourth Proportional to 128,775.88, 193,181.64 and 40,036.60

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Solution

The fourth proportional to 128,775.88, 193,181.64 and 40,036.60 is: 60,060.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,775.88 : 193,181.64 = 40,036.60 : x
  2. Step 2: Convert to fraction form
    128,775.88/193,181.64 = 40,036.60/x
  3. Step 3: Cross multiply
    128,775.88x = 193,181.64 × 40,036.60
  4. Step 4: Simplify right side
    128,775.88x = 7,734,336,048.02
  5. Step 5: Solve for x
    x = 7,734,336,048.02/128,775.88
  6. Step 6: Final answer
    x = 60,060.44

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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.