Home / 7,139.12-9,852-3,995.36

Finding the Fourth Proportional to 7,139.12, 9,852 and 3,995.36

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Solution

The fourth proportional to 7,139.12, 9,852 and 3,995.36 is: 5,513.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,139.12 : 9,852 = 3,995.36 : x
  2. Step 2: Convert to fraction form
    7,139.12/9,852 = 3,995.36/x
  3. Step 3: Cross multiply
    7,139.12x = 9,852 × 3,995.36
  4. Step 4: Simplify right side
    7,139.12x = 39,362,286.72
  5. Step 5: Solve for x
    x = 39,362,286.72/7,139.12
  6. Step 6: Final answer
    x = 5,513.60

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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.