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Finding the Fourth Proportional to 3,990.89, 5,983.35 and 1,909.19

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Solution

The fourth proportional to 3,990.89, 5,983.35 and 1,909.19 is: 2,862.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.89 : 5,983.35 = 1,909.19 : x
  2. Step 2: Convert to fraction form
    3,990.89/5,983.35 = 1,909.19/x
  3. Step 3: Cross multiply
    3,990.89x = 5,983.35 × 1,909.19
  4. Step 4: Simplify right side
    3,990.89x = 11,423,322.07
  5. Step 5: Solve for x
    x = 11,423,322.07/3,990.89
  6. Step 6: Final answer
    x = 2,862.35

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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.