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Finding the Fourth Proportional to 108,612.80, 162,940.80 and 91,203.20

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Solution

The fourth proportional to 108,612.80, 162,940.80 and 91,203.20 is: 136,822.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,612.80 : 162,940.80 = 91,203.20 : x
  2. Step 2: Convert to fraction form
    108,612.80/162,940.80 = 91,203.20/x
  3. Step 3: Cross multiply
    108,612.80x = 162,940.80 × 91,203.20
  4. Step 4: Simplify right side
    108,612.80x = 14,860,722,370.56
  5. Step 5: Solve for x
    x = 14,860,722,370.56/108,612.80
  6. Step 6: Final answer
    x = 136,822.94

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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.