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Finding the Fourth Proportional to 135,394.85, 186,885.39 and 87,651.42

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Solution

The fourth proportional to 135,394.85, 186,885.39 and 87,651.42 is: 120,985.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    135,394.85 : 186,885.39 = 87,651.42 : x
  2. Step 2: Convert to fraction form
    135,394.85/186,885.39 = 87,651.42/x
  3. Step 3: Cross multiply
    135,394.85x = 186,885.39 × 87,651.42
  4. Step 4: Simplify right side
    135,394.85x = 16,380,769,810.75
  5. Step 5: Solve for x
    x = 16,380,769,810.75/135,394.85
  6. Step 6: Final answer
    x = 120,985.18

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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.