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Finding the Fourth Proportional to 3,990.87, 5,985.09 and 2,430.81

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Solution

The fourth proportional to 3,990.87, 5,985.09 and 2,430.81 is: 3,645.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.87 : 5,985.09 = 2,430.81 : x
  2. Step 2: Convert to fraction form
    3,990.87/5,985.09 = 2,430.81/x
  3. Step 3: Cross multiply
    3,990.87x = 5,985.09 × 2,430.81
  4. Step 4: Simplify right side
    3,990.87x = 14,548,616.62
  5. Step 5: Solve for x
    x = 14,548,616.62/3,990.87
  6. Step 6: Final answer
    x = 3,645.47

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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.