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Finding the Fourth Proportional to 255,915.17, 383,858.91 and 78,422.69

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Solution

The fourth proportional to 255,915.17, 383,858.91 and 78,422.69 is: 117,629.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,915.17 : 383,858.91 = 78,422.69 : x
  2. Step 2: Convert to fraction form
    255,915.17/383,858.91 = 78,422.69/x
  3. Step 3: Cross multiply
    255,915.17x = 383,858.91 × 78,422.69
  4. Step 4: Simplify right side
    255,915.17x = 30,103,247,910.55
  5. Step 5: Solve for x
    x = 30,103,247,910.55/255,915.17
  6. Step 6: Final answer
    x = 117,629.79

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.