Home / 5,439.16-8,121.76-5,131.16

Finding the Fourth Proportional to 5,439.16, 8,121.76 and 5,131.16

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Solution

The fourth proportional to 5,439.16, 8,121.76 and 5,131.16 is: 7,661.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,439.16 : 8,121.76 = 5,131.16 : x
  2. Step 2: Convert to fraction form
    5,439.16/8,121.76 = 5,131.16/x
  3. Step 3: Cross multiply
    5,439.16x = 8,121.76 × 5,131.16
  4. Step 4: Simplify right side
    5,439.16x = 41,674,009.43
  5. Step 5: Solve for x
    x = 41,674,009.43/5,439.16
  6. Step 6: Final answer
    x = 7,661.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.