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Finding the Fourth Proportional to 76,859.81, 115,285.05 and 28,818.93

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Solution

The fourth proportional to 76,859.81, 115,285.05 and 28,818.93 is: 43,226.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,859.81 : 115,285.05 = 28,818.93 : x
  2. Step 2: Convert to fraction form
    76,859.81/115,285.05 = 28,818.93/x
  3. Step 3: Cross multiply
    76,859.81x = 115,285.05 × 28,818.93
  4. Step 4: Simplify right side
    76,859.81x = 3,322,391,786.00
  5. Step 5: Solve for x
    x = 3,322,391,786.00/76,859.81
  6. Step 6: Final answer
    x = 43,226.65

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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.