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Finding the Fourth Proportional to 4,066.40, 5,608.40 and 3,121

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Solution

The fourth proportional to 4,066.40, 5,608.40 and 3,121 is: 4,304.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,066.40 : 5,608.40 = 3,121 : x
  2. Step 2: Convert to fraction form
    4,066.40/5,608.40 = 3,121/x
  3. Step 3: Cross multiply
    4,066.40x = 5,608.40 × 3,121
  4. Step 4: Simplify right side
    4,066.40x = 17,503,816.40
  5. Step 5: Solve for x
    x = 17,503,816.40/4,066.40
  6. Step 6: Final answer
    x = 4,304.50

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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.