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Finding the Fourth Proportional to 72,660.78, 108,990.48 and 43,057.32

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Solution

The fourth proportional to 72,660.78, 108,990.48 and 43,057.32 is: 64,585.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,660.78 : 108,990.48 = 43,057.32 : x
  2. Step 2: Convert to fraction form
    72,660.78/108,990.48 = 43,057.32/x
  3. Step 3: Cross multiply
    72,660.78x = 108,990.48 × 43,057.32
  4. Step 4: Simplify right side
    72,660.78x = 4,692,837,974.31
  5. Step 5: Solve for x
    x = 4,692,837,974.31/72,660.78
  6. Step 6: Final answer
    x = 64,585.57

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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.