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Finding the Fourth Proportional to 169,765.20, 254,461.80 and 85,390.80

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Solution

The fourth proportional to 169,765.20, 254,461.80 and 85,390.80 is: 127,992.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    169,765.20 : 254,461.80 = 85,390.80 : x
  2. Step 2: Convert to fraction form
    169,765.20/254,461.80 = 85,390.80/x
  3. Step 3: Cross multiply
    169,765.20x = 254,461.80 × 85,390.80
  4. Step 4: Simplify right side
    169,765.20x = 21,728,696,671.44
  5. Step 5: Solve for x
    x = 21,728,696,671.44/169,765.20
  6. Step 6: Final answer
    x = 127,992.64

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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.