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Finding the Fourth Proportional to 78,620.88, 117,742.68 and 69,164.84

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Solution

The fourth proportional to 78,620.88, 117,742.68 and 69,164.84 is: 103,581.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,620.88 : 117,742.68 = 69,164.84 : x
  2. Step 2: Convert to fraction form
    78,620.88/117,742.68 = 69,164.84/x
  3. Step 3: Cross multiply
    78,620.88x = 117,742.68 × 69,164.84
  4. Step 4: Simplify right side
    78,620.88x = 8,143,653,623.37
  5. Step 5: Solve for x
    x = 8,143,653,623.37/78,620.88
  6. Step 6: Final answer
    x = 103,581.31

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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.