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Finding the Fourth Proportional to 71,540.30, 107,310.45 and 61,690.70

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Solution

The fourth proportional to 71,540.30, 107,310.45 and 61,690.70 is: 92,536.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,540.30 : 107,310.45 = 61,690.70 : x
  2. Step 2: Convert to fraction form
    71,540.30/107,310.45 = 61,690.70/x
  3. Step 3: Cross multiply
    71,540.30x = 107,310.45 × 61,690.70
  4. Step 4: Simplify right side
    71,540.30x = 6,620,056,777.82
  5. Step 5: Solve for x
    x = 6,620,056,777.82/71,540.30
  6. Step 6: Final answer
    x = 92,536.05

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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.