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Finding the Fourth Proportional to 78,928.80, 108,903.84 and 47,091.52

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Solution

The fourth proportional to 78,928.80, 108,903.84 and 47,091.52 is: 64,975.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,928.80 : 108,903.84 = 47,091.52 : x
  2. Step 2: Convert to fraction form
    78,928.80/108,903.84 = 47,091.52/x
  3. Step 3: Cross multiply
    78,928.80x = 108,903.84 × 47,091.52
  4. Step 4: Simplify right side
    78,928.80x = 5,128,447,359.44
  5. Step 5: Solve for x
    x = 5,128,447,359.44/78,928.80
  6. Step 6: Final answer
    x = 64,975.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.