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Finding the Fourth Proportional to 121,986.20, 168,250.56 and 86,138.84

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Solution

The fourth proportional to 121,986.20, 168,250.56 and 86,138.84 is: 118,807.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,986.20 : 168,250.56 = 86,138.84 : x
  2. Step 2: Convert to fraction form
    121,986.20/168,250.56 = 86,138.84/x
  3. Step 3: Cross multiply
    121,986.20x = 168,250.56 × 86,138.84
  4. Step 4: Simplify right side
    121,986.20x = 14,492,908,067.75
  5. Step 5: Solve for x
    x = 14,492,908,067.75/121,986.20
  6. Step 6: Final answer
    x = 118,807.77

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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.