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Finding the Fourth Proportional to 128,663.08, 193,049.70 and 53,800.72

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Solution

The fourth proportional to 128,663.08, 193,049.70 and 53,800.72 is: 80,724.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,663.08 : 193,049.70 = 53,800.72 : x
  2. Step 2: Convert to fraction form
    128,663.08/193,049.70 = 53,800.72/x
  3. Step 3: Cross multiply
    128,663.08x = 193,049.70 × 53,800.72
  4. Step 4: Simplify right side
    128,663.08x = 10,386,212,855.78
  5. Step 5: Solve for x
    x = 10,386,212,855.78/128,663.08
  6. Step 6: Final answer
    x = 80,724.11

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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.