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Finding the Fourth Proportional to 108,642.75, 162,990.75 and 87,771.89

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Solution

The fourth proportional to 108,642.75, 162,990.75 and 87,771.89 is: 131,679.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    108,642.75 : 162,990.75 = 87,771.89 : x
  2. Step 2: Convert to fraction form
    108,642.75/162,990.75 = 87,771.89/x
  3. Step 3: Cross multiply
    108,642.75x = 162,990.75 × 87,771.89
  4. Step 4: Simplify right side
    108,642.75x = 14,306,005,365.06
  5. Step 5: Solve for x
    x = 14,306,005,365.06/108,642.75
  6. Step 6: Final answer
    x = 131,679.34

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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.