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Finding the Fourth Proportional to 215,079.63, 322,430.81 and 81,871.29

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Solution

The fourth proportional to 215,079.63, 322,430.81 and 81,871.29 is: 122,735.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    215,079.63 : 322,430.81 = 81,871.29 : x
  2. Step 2: Convert to fraction form
    215,079.63/322,430.81 = 81,871.29/x
  3. Step 3: Cross multiply
    215,079.63x = 322,430.81 × 81,871.29
  4. Step 4: Simplify right side
    215,079.63x = 26,397,824,738.29
  5. Step 5: Solve for x
    x = 26,397,824,738.29/215,079.63
  6. Step 6: Final answer
    x = 122,735.12

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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.