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Finding the Fourth Proportional to 128,876.48, 193,392.64 and 45,764.16

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Solution

The fourth proportional to 128,876.48, 193,392.64 and 45,764.16 is: 68,673.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,876.48 : 193,392.64 = 45,764.16 : x
  2. Step 2: Convert to fraction form
    128,876.48/193,392.64 = 45,764.16/x
  3. Step 3: Cross multiply
    128,876.48x = 193,392.64 × 45,764.16
  4. Step 4: Simplify right side
    128,876.48x = 8,850,451,719.78
  5. Step 5: Solve for x
    x = 8,850,451,719.78/128,876.48
  6. Step 6: Final answer
    x = 68,673.91

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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.