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Finding the Fourth Proportional to 169,783.20, 254,488.80 and 85,408.80

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Solution

The fourth proportional to 169,783.20, 254,488.80 and 85,408.80 is: 128,019.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    169,783.20 : 254,488.80 = 85,408.80 : x
  2. Step 2: Convert to fraction form
    169,783.20/254,488.80 = 85,408.80/x
  3. Step 3: Cross multiply
    169,783.20x = 254,488.80 × 85,408.80
  4. Step 4: Simplify right side
    169,783.20x = 21,735,583,021.44
  5. Step 5: Solve for x
    x = 21,735,583,021.44/169,783.20
  6. Step 6: Final answer
    x = 128,019.63

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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.