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Finding the Fourth Proportional to 108,640.80, 162,572.40 and 99,309.60

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Solution

The fourth proportional to 108,640.80, 162,572.40 and 99,309.60 is: 148,608.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,640.80 : 162,572.40 = 99,309.60 : x
  2. Step 2: Convert to fraction form
    108,640.80/162,572.40 = 99,309.60/x
  3. Step 3: Cross multiply
    108,640.80x = 162,572.40 × 99,309.60
  4. Step 4: Simplify right side
    108,640.80x = 16,145,000,015.04
  5. Step 5: Solve for x
    x = 16,145,000,015.04/108,640.80
  6. Step 6: Final answer
    x = 148,608.99

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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.