Home / 7,139.20-9,852.10-3,995.39

Finding the Fourth Proportional to 7,139.20, 9,852.10 and 3,995.39

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Solution

The fourth proportional to 7,139.20, 9,852.10 and 3,995.39 is: 5,513.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,139.20 : 9,852.10 = 3,995.39 : x
  2. Step 2: Convert to fraction form
    7,139.20/9,852.10 = 3,995.39/x
  3. Step 3: Cross multiply
    7,139.20x = 9,852.10 × 3,995.39
  4. Step 4: Simplify right side
    7,139.20x = 39,362,932.56
  5. Step 5: Solve for x
    x = 39,362,932.56/7,139.20
  6. Step 6: Final answer
    x = 5,513.64

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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.