Home / 7,143.28-9,858.18-3,999.64

Finding the Fourth Proportional to 7,143.28, 9,858.18 and 3,999.64

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Solution

The fourth proportional to 7,143.28, 9,858.18 and 3,999.64 is: 5,519.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,143.28 : 9,858.18 = 3,999.64 : x
  2. Step 2: Convert to fraction form
    7,143.28/9,858.18 = 3,999.64/x
  3. Step 3: Cross multiply
    7,143.28x = 9,858.18 × 3,999.64
  4. Step 4: Simplify right side
    7,143.28x = 39,429,171.06
  5. Step 5: Solve for x
    x = 39,429,171.06/7,143.28
  6. Step 6: Final answer
    x = 5,519.76

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Double scale
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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.