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Finding the Fourth Proportional to 72,665.60, 109,003.80 and 25,912.40

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Solution

The fourth proportional to 72,665.60, 109,003.80 and 25,912.40 is: 38,870.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,665.60 : 109,003.80 = 25,912.40 : x
  2. Step 2: Convert to fraction form
    72,665.60/109,003.80 = 25,912.40/x
  3. Step 3: Cross multiply
    72,665.60x = 109,003.80 × 25,912.40
  4. Step 4: Simplify right side
    72,665.60x = 2,824,550,067.12
  5. Step 5: Solve for x
    x = 2,824,550,067.12/72,665.60
  6. Step 6: Final answer
    x = 38,870.53

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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.