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Finding the Fourth Proportional to 72,502.80, 108,754.20 and 66,816.60

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Solution

The fourth proportional to 72,502.80, 108,754.20 and 66,816.60 is: 100,224.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,502.80 : 108,754.20 = 66,816.60 : x
  2. Step 2: Convert to fraction form
    72,502.80/108,754.20 = 66,816.60/x
  3. Step 3: Cross multiply
    72,502.80x = 108,754.20 × 66,816.60
  4. Step 4: Simplify right side
    72,502.80x = 7,266,585,879.72
  5. Step 5: Solve for x
    x = 7,266,585,879.72/72,502.80
  6. Step 6: Final answer
    x = 100,224.90

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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.