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Finding the Fourth Proportional to 78,400.80, 117,428.40 and 47,181.60

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Solution

The fourth proportional to 78,400.80, 117,428.40 and 47,181.60 is: 70,668.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,400.80 : 117,428.40 = 47,181.60 : x
  2. Step 2: Convert to fraction form
    78,400.80/117,428.40 = 47,181.60/x
  3. Step 3: Cross multiply
    78,400.80x = 117,428.40 × 47,181.60
  4. Step 4: Simplify right side
    78,400.80x = 5,540,459,797.44
  5. Step 5: Solve for x
    x = 5,540,459,797.44/78,400.80
  6. Step 6: Final answer
    x = 70,668.41

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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.