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Finding the Fourth Proportional to 108,971.80, 163,068.90 and 99,640.60

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Solution

The fourth proportional to 108,971.80, 163,068.90 and 99,640.60 is: 149,105.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,971.80 : 163,068.90 = 99,640.60 : x
  2. Step 2: Convert to fraction form
    108,971.80/163,068.90 = 99,640.60/x
  3. Step 3: Cross multiply
    108,971.80x = 163,068.90 × 99,640.60
  4. Step 4: Simplify right side
    108,971.80x = 16,248,283,037.34
  5. Step 5: Solve for x
    x = 16,248,283,037.34/108,971.80
  6. Step 6: Final answer
    x = 149,105.39

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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.