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Finding the Fourth Proportional to 7,886.70, 11,830.05 and 3,990.60

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Solution

The fourth proportional to 7,886.70, 11,830.05 and 3,990.60 is: 5,985.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,886.70 : 11,830.05 = 3,990.60 : x
  2. Step 2: Convert to fraction form
    7,886.70/11,830.05 = 3,990.60/x
  3. Step 3: Cross multiply
    7,886.70x = 11,830.05 × 3,990.60
  4. Step 4: Simplify right side
    7,886.70x = 47,208,997.53
  5. Step 5: Solve for x
    x = 47,208,997.53/7,886.70
  6. Step 6: Final answer
    x = 5,985.90

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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.