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Finding the Fourth Proportional to 108,136.80, 162,205.20 and 90,640.80

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Solution

The fourth proportional to 108,136.80, 162,205.20 and 90,640.80 is: 135,961.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,136.80 : 162,205.20 = 90,640.80 : x
  2. Step 2: Convert to fraction form
    108,136.80/162,205.20 = 90,640.80/x
  3. Step 3: Cross multiply
    108,136.80x = 162,205.20 × 90,640.80
  4. Step 4: Simplify right side
    108,136.80x = 14,702,409,092.16
  5. Step 5: Solve for x
    x = 14,702,409,092.16/108,136.80
  6. Step 6: Final answer
    x = 135,961.20

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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.