Home / 3,990.60-5,985.09-1,359.90

Finding the Fourth Proportional to 3,990.60, 5,985.09 and 1,359.90

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Solution

The fourth proportional to 3,990.60, 5,985.09 and 1,359.90 is: 2,039.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.60 : 5,985.09 = 1,359.90 : x
  2. Step 2: Convert to fraction form
    3,990.60/5,985.09 = 1,359.90/x
  3. Step 3: Cross multiply
    3,990.60x = 5,985.09 × 1,359.90
  4. Step 4: Simplify right side
    3,990.60x = 8,139,123.89
  5. Step 5: Solve for x
    x = 8,139,123.89/3,990.60
  6. Step 6: Final answer
    x = 2,039.57

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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.