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Finding the Fourth Proportional to 170,999.61, 256,503.83 and 81,021.21

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Solution

The fourth proportional to 170,999.61, 256,503.83 and 81,021.21 is: 121,533.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    170,999.61 : 256,503.83 = 81,021.21 : x
  2. Step 2: Convert to fraction form
    170,999.61/256,503.83 = 81,021.21/x
  3. Step 3: Cross multiply
    170,999.61x = 256,503.83 × 81,021.21
  4. Step 4: Simplify right side
    170,999.61x = 20,782,250,271.13
  5. Step 5: Solve for x
    x = 20,782,250,271.13/170,999.61
  6. Step 6: Final answer
    x = 121,533.90

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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.