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Finding the Fourth Proportional to 76,872.40, 115,308.60 and 41,880.40

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Solution

The fourth proportional to 76,872.40, 115,308.60 and 41,880.40 is: 62,820.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,872.40 : 115,308.60 = 41,880.40 : x
  2. Step 2: Convert to fraction form
    76,872.40/115,308.60 = 41,880.40/x
  3. Step 3: Cross multiply
    76,872.40x = 115,308.60 × 41,880.40
  4. Step 4: Simplify right side
    76,872.40x = 4,829,170,291.44
  5. Step 5: Solve for x
    x = 4,829,170,291.44/76,872.40
  6. Step 6: Final answer
    x = 62,820.60

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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.