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Finding the Fourth Proportional to 76,658.78, 105,789.09 and 43,124.78

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Solution

The fourth proportional to 76,658.78, 105,789.09 and 43,124.78 is: 59,512.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,658.78 : 105,789.09 = 43,124.78 : x
  2. Step 2: Convert to fraction form
    76,658.78/105,789.09 = 43,124.78/x
  3. Step 3: Cross multiply
    76,658.78x = 105,789.09 × 43,124.78
  4. Step 4: Simplify right side
    76,658.78x = 4,562,131,232.65
  5. Step 5: Solve for x
    x = 4,562,131,232.65/76,658.78
  6. Step 6: Final answer
    x = 59,512.18

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1.5x scale

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.