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Finding the Fourth Proportional to 108,671.75, 149,793.80 and 85,664.08

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Solution

The fourth proportional to 108,671.75, 149,793.80 and 85,664.08 is: 118,079.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,671.75 : 149,793.80 = 85,664.08 : x
  2. Step 2: Convert to fraction form
    108,671.75/149,793.80 = 85,664.08/x
  3. Step 3: Cross multiply
    108,671.75x = 149,793.80 × 85,664.08
  4. Step 4: Simplify right side
    108,671.75x = 12,831,948,066.70
  5. Step 5: Solve for x
    x = 12,831,948,066.70/108,671.75
  6. Step 6: Final answer
    x = 118,079.89

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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.