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Finding the Fourth Proportional to 121,119.90, 166,972.21 and 85,198.42

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Solution

The fourth proportional to 121,119.90, 166,972.21 and 85,198.42 is: 117,451.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,119.90 : 166,972.21 = 85,198.42 : x
  2. Step 2: Convert to fraction form
    121,119.90/166,972.21 = 85,198.42/x
  3. Step 3: Cross multiply
    121,119.90x = 166,972.21 × 85,198.42
  4. Step 4: Simplify right side
    121,119.90x = 14,225,768,475.91
  5. Step 5: Solve for x
    x = 14,225,768,475.91/121,119.90
  6. Step 6: Final answer
    x = 117,451.95

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1.5x scale

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.