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Finding the Fourth Proportional to 108,919.80, 163,347.30 and 42,321.60

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Solution

The fourth proportional to 108,919.80, 163,347.30 and 42,321.60 is: 63,469.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,919.80 : 163,347.30 = 42,321.60 : x
  2. Step 2: Convert to fraction form
    108,919.80/163,347.30 = 42,321.60/x
  3. Step 3: Cross multiply
    108,919.80x = 163,347.30 × 42,321.60
  4. Step 4: Simplify right side
    108,919.80x = 6,913,119,091.68
  5. Step 5: Solve for x
    x = 6,913,119,091.68/108,919.80
  6. Step 6: Final answer
    x = 63,469.81

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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.