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Finding the Fourth Proportional to 78,858.44, 118,217.32 and 28,926.86

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Solution

The fourth proportional to 78,858.44, 118,217.32 and 28,926.86 is: 43,364.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,858.44 : 118,217.32 = 28,926.86 : x
  2. Step 2: Convert to fraction form
    78,858.44/118,217.32 = 28,926.86/x
  3. Step 3: Cross multiply
    78,858.44x = 118,217.32 × 28,926.86
  4. Step 4: Simplify right side
    78,858.44x = 3,419,655,865.22
  5. Step 5: Solve for x
    x = 3,419,655,865.22/78,858.44
  6. Step 6: Final answer
    x = 43,364.49

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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.