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Finding the Fourth Proportional to 72,615.80, 108,923.70 and 66,054.80

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Solution

The fourth proportional to 72,615.80, 108,923.70 and 66,054.80 is: 99,082.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,615.80 : 108,923.70 = 66,054.80 : x
  2. Step 2: Convert to fraction form
    72,615.80/108,923.70 = 66,054.80/x
  3. Step 3: Cross multiply
    72,615.80x = 108,923.70 × 66,054.80
  4. Step 4: Simplify right side
    72,615.80x = 7,194,933,218.76
  5. Step 5: Solve for x
    x = 7,194,933,218.76/72,615.80
  6. Step 6: Final answer
    x = 99,082.20

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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.