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Finding the Fourth Proportional to 78,550.91, 117,754.87 and 28,619.63

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Solution

The fourth proportional to 78,550.91, 117,754.87 and 28,619.63 is: 42,903.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,550.91 : 117,754.87 = 28,619.63 : x
  2. Step 2: Convert to fraction form
    78,550.91/117,754.87 = 28,619.63/x
  3. Step 3: Cross multiply
    78,550.91x = 117,754.87 × 28,619.63
  4. Step 4: Simplify right side
    78,550.91x = 3,370,100,810.10
  5. Step 5: Solve for x
    x = 3,370,100,810.10/78,550.91
  6. Step 6: Final answer
    x = 42,903.40

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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.