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Finding the Fourth Proportional to 255,991.74, 383,993.14 and 78,494.82

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Solution

The fourth proportional to 255,991.74, 383,993.14 and 78,494.82 is: 117,743.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,991.74 : 383,993.14 = 78,494.82 : x
  2. Step 2: Convert to fraction form
    255,991.74/383,993.14 = 78,494.82/x
  3. Step 3: Cross multiply
    255,991.74x = 383,993.14 × 78,494.82
  4. Step 4: Simplify right side
    255,991.74x = 30,141,472,405.53
  5. Step 5: Solve for x
    x = 30,141,472,405.53/255,991.74
  6. Step 6: Final answer
    x = 117,743.93

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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.