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Finding the Fourth Proportional to 78,485.80, 117,728.70 and 53,602.60

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Solution

The fourth proportional to 78,485.80, 117,728.70 and 53,602.60 is: 80,403.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,485.80 : 117,728.70 = 53,602.60 : x
  2. Step 2: Convert to fraction form
    78,485.80/117,728.70 = 53,602.60/x
  3. Step 3: Cross multiply
    78,485.80x = 117,728.70 × 53,602.60
  4. Step 4: Simplify right side
    78,485.80x = 6,310,564,414.62
  5. Step 5: Solve for x
    x = 6,310,564,414.62/78,485.80
  6. Step 6: Final answer
    x = 80,403.90

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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.