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Finding the Fourth Proportional to 230,930.66, 318,656.19 and 128,961.79

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Solution

The fourth proportional to 230,930.66, 318,656.19 and 128,961.79 is: 177,951.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    230,930.66 : 318,656.19 = 128,961.79 : x
  2. Step 2: Convert to fraction form
    230,930.66/318,656.19 = 128,961.79/x
  3. Step 3: Cross multiply
    230,930.66x = 318,656.19 × 128,961.79
  4. Step 4: Simplify right side
    230,930.66x = 41,094,472,656.98
  5. Step 5: Solve for x
    x = 41,094,472,656.98/230,930.66
  6. Step 6: Final answer
    x = 177,951.57

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.