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Finding the Fourth Proportional to 78,474.80, 117,712.20 and 69,873.20

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Solution

The fourth proportional to 78,474.80, 117,712.20 and 69,873.20 is: 104,809.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,474.80 : 117,712.20 = 69,873.20 : x
  2. Step 2: Convert to fraction form
    78,474.80/117,712.20 = 69,873.20/x
  3. Step 3: Cross multiply
    78,474.80x = 117,712.20 × 69,873.20
  4. Step 4: Simplify right side
    78,474.80x = 8,224,928,093.04
  5. Step 5: Solve for x
    x = 8,224,928,093.04/78,474.80
  6. Step 6: Final answer
    x = 104,809.80

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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.