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Finding the Fourth Proportional to 78,906.90, 118,289.88 and 28,975.40

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Solution

The fourth proportional to 78,906.90, 118,289.88 and 28,975.40 is: 43,437.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,906.90 : 118,289.88 = 28,975.40 : x
  2. Step 2: Convert to fraction form
    78,906.90/118,289.88 = 28,975.40/x
  3. Step 3: Cross multiply
    78,906.90x = 118,289.88 × 28,975.40
  4. Step 4: Simplify right side
    78,906.90x = 3,427,495,997.50
  5. Step 5: Solve for x
    x = 3,427,495,997.50/78,906.90
  6. Step 6: Final answer
    x = 43,437.22

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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.