Home / 5,120.16-7,679.31-1,421.46

Finding the Fourth Proportional to 5,120.16, 7,679.31 and 1,421.46

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Solution

The fourth proportional to 5,120.16, 7,679.31 and 1,421.46 is: 2,131.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,120.16 : 7,679.31 = 1,421.46 : x
  2. Step 2: Convert to fraction form
    5,120.16/7,679.31 = 1,421.46/x
  3. Step 3: Cross multiply
    5,120.16x = 7,679.31 × 1,421.46
  4. Step 4: Simplify right side
    5,120.16x = 10,915,831.99
  5. Step 5: Solve for x
    x = 10,915,831.99/5,120.16
  6. Step 6: Final answer
    x = 2,131.93

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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.