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Finding the Fourth Proportional to 78,630.40, 117,945.60 and 61,112.80

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Solution

The fourth proportional to 78,630.40, 117,945.60 and 61,112.80 is: 91,669.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,630.40 : 117,945.60 = 61,112.80 : x
  2. Step 2: Convert to fraction form
    78,630.40/117,945.60 = 61,112.80/x
  3. Step 3: Cross multiply
    78,630.40x = 117,945.60 × 61,112.80
  4. Step 4: Simplify right side
    78,630.40x = 7,207,985,863.68
  5. Step 5: Solve for x
    x = 7,207,985,863.68/78,630.40
  6. Step 6: Final answer
    x = 91,669.20

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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.