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Finding the Fourth Proportional to 78,466.60, 117,662.80 and 28,511.88

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Solution

The fourth proportional to 78,466.60, 117,662.80 and 28,511.88 is: 42,754.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,466.60 : 117,662.80 = 28,511.88 : x
  2. Step 2: Convert to fraction form
    78,466.60/117,662.80 = 28,511.88/x
  3. Step 3: Cross multiply
    78,466.60x = 117,662.80 × 28,511.88
  4. Step 4: Simplify right side
    78,466.60x = 3,354,787,634.06
  5. Step 5: Solve for x
    x = 3,354,787,634.06/78,466.60
  6. Step 6: Final answer
    x = 42,754.34

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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.