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Finding the Fourth Proportional to 78,550.92, 117,754.88 and 28,619.64

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Solution

The fourth proportional to 78,550.92, 117,754.88 and 28,619.64 is: 42,903.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,550.92 : 117,754.88 = 28,619.64 : x
  2. Step 2: Convert to fraction form
    78,550.92/117,754.88 = 28,619.64/x
  3. Step 3: Cross multiply
    78,550.92x = 117,754.88 × 28,619.64
  4. Step 4: Simplify right side
    78,550.92x = 3,370,102,130.75
  5. Step 5: Solve for x
    x = 3,370,102,130.75/78,550.92
  6. Step 6: Final answer
    x = 42,903.41

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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.