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Finding the Fourth Proportional to 78,489.80, 117,734.70 and 53,606.60

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Solution

The fourth proportional to 78,489.80, 117,734.70 and 53,606.60 is: 80,409.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,489.80 : 117,734.70 = 53,606.60 : x
  2. Step 2: Convert to fraction form
    78,489.80/117,734.70 = 53,606.60/x
  3. Step 3: Cross multiply
    78,489.80x = 117,734.70 × 53,606.60
  4. Step 4: Simplify right side
    78,489.80x = 6,311,356,969.02
  5. Step 5: Solve for x
    x = 6,311,356,969.02/78,489.80
  6. Step 6: Final answer
    x = 80,409.90

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1.5x scale

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.