Home / 7,122.95-9,829.64-3,936.15

Finding the Fourth Proportional to 7,122.95, 9,829.64 and 3,936.15

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Solution

The fourth proportional to 7,122.95, 9,829.64 and 3,936.15 is: 5,431.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,122.95 : 9,829.64 = 3,936.15 : x
  2. Step 2: Convert to fraction form
    7,122.95/9,829.64 = 3,936.15/x
  3. Step 3: Cross multiply
    7,122.95x = 9,829.64 × 3,936.15
  4. Step 4: Simplify right side
    7,122.95x = 38,690,969.44
  5. Step 5: Solve for x
    x = 38,690,969.44/7,122.95
  6. Step 6: Final answer
    x = 5,431.88

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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.