Home / 9,121.43-12,588.16-5,142.80

Finding the Fourth Proportional to 9,121.43, 12,588.16 and 5,142.80

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Solution

The fourth proportional to 9,121.43, 12,588.16 and 5,142.80 is: 7,097.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,121.43 : 12,588.16 = 5,142.80 : x
  2. Step 2: Convert to fraction form
    9,121.43/12,588.16 = 5,142.80/x
  3. Step 3: Cross multiply
    9,121.43x = 12,588.16 × 5,142.80
  4. Step 4: Simplify right side
    9,121.43x = 64,738,313.45
  5. Step 5: Solve for x
    x = 64,738,313.45/9,121.43
  6. Step 6: Final answer
    x = 7,097.39

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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.