Home / 5,120.82-7,065.43-3,130.65

Finding the Fourth Proportional to 5,120.82, 7,065.43 and 3,130.65

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Solution

The fourth proportional to 5,120.82, 7,065.43 and 3,130.65 is: 4,319.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120.82 : 7,065.43 = 3,130.65 : x
  2. Step 2: Convert to fraction form
    5,120.82/7,065.43 = 3,130.65/x
  3. Step 3: Cross multiply
    5,120.82x = 7,065.43 × 3,130.65
  4. Step 4: Simplify right side
    5,120.82x = 22,119,380.60
  5. Step 5: Solve for x
    x = 22,119,380.60/5,120.82
  6. Step 6: Final answer
    x = 4,319.50

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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.