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Finding the Fourth Proportional to 128,968.76, 193,378.64 and 49,990.72

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Solution

The fourth proportional to 128,968.76, 193,378.64 and 49,990.72 is: 74,957.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,968.76 : 193,378.64 = 49,990.72 : x
  2. Step 2: Convert to fraction form
    128,968.76/193,378.64 = 49,990.72/x
  3. Step 3: Cross multiply
    128,968.76x = 193,378.64 × 49,990.72
  4. Step 4: Simplify right side
    128,968.76x = 9,667,137,356.60
  5. Step 5: Solve for x
    x = 9,667,137,356.60/128,968.76
  6. Step 6: Final answer
    x = 74,957.20

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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.