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Finding the Fourth Proportional to 3,990.60, 5,985.90 and 3,285.90

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Solution

The fourth proportional to 3,990.60, 5,985.90 and 3,285.90 is: 4,928.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.60 : 5,985.90 = 3,285.90 : x
  2. Step 2: Convert to fraction form
    3,990.60/5,985.90 = 3,285.90/x
  3. Step 3: Cross multiply
    3,990.60x = 5,985.90 × 3,285.90
  4. Step 4: Simplify right side
    3,990.60x = 19,669,068.81
  5. Step 5: Solve for x
    x = 19,669,068.81/3,990.60
  6. Step 6: Final answer
    x = 4,928.85

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Similar ratio
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1.5x scale

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.