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Finding the Fourth Proportional to 170,999.11, 256,503.08 and 81,020.71

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Solution

The fourth proportional to 170,999.11, 256,503.08 and 81,020.71 is: 121,533.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,999.11 : 256,503.08 = 81,020.71 : x
  2. Step 2: Convert to fraction form
    170,999.11/256,503.08 = 81,020.71/x
  3. Step 3: Cross multiply
    170,999.11x = 256,503.08 × 81,020.71
  4. Step 4: Simplify right side
    170,999.11x = 20,782,061,658.79
  5. Step 5: Solve for x
    x = 20,782,061,658.79/170,999.11
  6. Step 6: Final answer
    x = 121,533.16

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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.