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Finding the Fourth Proportional to 170,987.72, 256,485.96 and 81,009.37

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Solution

The fourth proportional to 170,987.72, 256,485.96 and 81,009.37 is: 121,516.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,987.72 : 256,485.96 = 81,009.37 : x
  2. Step 2: Convert to fraction form
    170,987.72/256,485.96 = 81,009.37/x
  3. Step 3: Cross multiply
    170,987.72x = 256,485.96 × 81,009.37
  4. Step 4: Simplify right side
    170,987.72x = 20,777,764,751.02
  5. Step 5: Solve for x
    x = 20,777,764,751.02/170,987.72
  6. Step 6: Final answer
    x = 121,516.12

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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.