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Finding the Fourth Proportional to 108,672.06, 149,911.84 and 72,435.90

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Solution

The fourth proportional to 108,672.06, 149,911.84 and 72,435.90 is: 99,924.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,672.06 : 149,911.84 = 72,435.90 : x
  2. Step 2: Convert to fraction form
    108,672.06/149,911.84 = 72,435.90/x
  3. Step 3: Cross multiply
    108,672.06x = 149,911.84 × 72,435.90
  4. Step 4: Simplify right side
    108,672.06x = 10,858,999,051.06
  5. Step 5: Solve for x
    x = 10,858,999,051.06/108,672.06
  6. Step 6: Final answer
    x = 99,924.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.