Home / 7,015.20-9,680.80-3,871.28

Finding the Fourth Proportional to 7,015.20, 9,680.80 and 3,871.28

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Solution

The fourth proportional to 7,015.20, 9,680.80 and 3,871.28 is: 5,342.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,015.20 : 9,680.80 = 3,871.28 : x
  2. Step 2: Convert to fraction form
    7,015.20/9,680.80 = 3,871.28/x
  3. Step 3: Cross multiply
    7,015.20x = 9,680.80 × 3,871.28
  4. Step 4: Simplify right side
    7,015.20x = 37,477,087.42
  5. Step 5: Solve for x
    x = 37,477,087.42/7,015.20
  6. Step 6: Final answer
    x = 5,342.27

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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.