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Finding the Fourth Proportional to 120,987.84, 166,963.68 and 83,196.48

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Solution

The fourth proportional to 120,987.84, 166,963.68 and 83,196.48 is: 114,811.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    120,987.84 : 166,963.68 = 83,196.48 : x
  2. Step 2: Convert to fraction form
    120,987.84/166,963.68 = 83,196.48/x
  3. Step 3: Cross multiply
    120,987.84x = 166,963.68 × 83,196.48
  4. Step 4: Simplify right side
    120,987.84x = 13,890,790,463.85
  5. Step 5: Solve for x
    x = 13,890,790,463.85/120,987.84
  6. Step 6: Final answer
    x = 114,811.46

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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.