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Finding the Fourth Proportional to 3,990.57, 5,495.09 and 3,902.06

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Solution

The fourth proportional to 3,990.57, 5,495.09 and 3,902.06 is: 5,373.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.57 : 5,495.09 = 3,902.06 : x
  2. Step 2: Convert to fraction form
    3,990.57/5,495.09 = 3,902.06/x
  3. Step 3: Cross multiply
    3,990.57x = 5,495.09 × 3,902.06
  4. Step 4: Simplify right side
    3,990.57x = 21,442,194.38
  5. Step 5: Solve for x
    x = 21,442,194.38/3,990.57
  6. Step 6: Final answer
    x = 5,373.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.