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Finding the Fourth Proportional to 78,448.57, 117,635.90 and 28,493.44

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Solution

The fourth proportional to 78,448.57, 117,635.90 and 28,493.44 is: 42,726.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,448.57 : 117,635.90 = 28,493.44 : x
  2. Step 2: Convert to fraction form
    78,448.57/117,635.90 = 28,493.44/x
  3. Step 3: Cross multiply
    78,448.57x = 117,635.90 × 28,493.44
  4. Step 4: Simplify right side
    78,448.57x = 3,351,851,316.03
  5. Step 5: Solve for x
    x = 3,351,851,316.03/78,448.57
  6. Step 6: Final answer
    x = 42,726.74

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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.