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Finding the Fourth Proportional to 171,292.80, 256,939.20 and 121,429.20

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Solution

The fourth proportional to 171,292.80, 256,939.20 and 121,429.20 is: 182,143.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    171,292.80 : 256,939.20 = 121,429.20 : x
  2. Step 2: Convert to fraction form
    171,292.80/256,939.20 = 121,429.20/x
  3. Step 3: Cross multiply
    171,292.80x = 256,939.20 × 121,429.20
  4. Step 4: Simplify right side
    171,292.80x = 31,199,921,504.64
  5. Step 5: Solve for x
    x = 31,199,921,504.64/171,292.80
  6. Step 6: Final answer
    x = 182,143.80

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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.