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Finding the Fourth Proportional to 7,143.60, 9,858.12 and 3,999.60

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Solution

The fourth proportional to 7,143.60, 9,858.12 and 3,999.60 is: 5,519.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,143.60 : 9,858.12 = 3,999.60 : x
  2. Step 2: Convert to fraction form
    7,143.60/9,858.12 = 3,999.60/x
  3. Step 3: Cross multiply
    7,143.60x = 9,858.12 × 3,999.60
  4. Step 4: Simplify right side
    7,143.60x = 39,428,536.75
  5. Step 5: Solve for x
    x = 39,428,536.75/7,143.60
  6. Step 6: Final answer
    x = 5,519.42

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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.