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Finding the Fourth Proportional to 5,135.80, 7,710.90 and 3,191.80

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Solution

The fourth proportional to 5,135.80, 7,710.90 and 3,191.80 is: 4,792.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,135.80 : 7,710.90 = 3,191.80 : x
  2. Step 2: Convert to fraction form
    5,135.80/7,710.90 = 3,191.80/x
  3. Step 3: Cross multiply
    5,135.80x = 7,710.90 × 3,191.80
  4. Step 4: Simplify right side
    5,135.80x = 24,611,650.62
  5. Step 5: Solve for x
    x = 24,611,650.62/5,135.80
  6. Step 6: Final answer
    x = 4,792.17

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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.