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Finding the Fourth Proportional to 78,827.80, 118,241.70 and 72,376.60

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Solution

The fourth proportional to 78,827.80, 118,241.70 and 72,376.60 is: 108,564.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,827.80 : 118,241.70 = 72,376.60 : x
  2. Step 2: Convert to fraction form
    78,827.80/118,241.70 = 72,376.60/x
  3. Step 3: Cross multiply
    78,827.80x = 118,241.70 × 72,376.60
  4. Step 4: Simplify right side
    78,827.80x = 8,557,932,224.22
  5. Step 5: Solve for x
    x = 8,557,932,224.22/78,827.80
  6. Step 6: Final answer
    x = 108,564.90

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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.