Home / 5,119.89-7,678.41-1,421.24

Finding the Fourth Proportional to 5,119.89, 7,678.41 and 1,421.24

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Solution

The fourth proportional to 5,119.89, 7,678.41 and 1,421.24 is: 2,131.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,119.89 : 7,678.41 = 1,421.24 : x
  2. Step 2: Convert to fraction form
    5,119.89/7,678.41 = 1,421.24/x
  3. Step 3: Cross multiply
    5,119.89x = 7,678.41 × 1,421.24
  4. Step 4: Simplify right side
    5,119.89x = 10,912,856.32
  5. Step 5: Solve for x
    x = 10,912,856.32/5,119.89
  6. Step 6: Final answer
    x = 2,131.46

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.