Home / 9,121.75-12,588.12-5,142.86

Finding the Fourth Proportional to 9,121.75, 12,588.12 and 5,142.86

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Solution

The fourth proportional to 9,121.75, 12,588.12 and 5,142.86 is: 7,097.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,121.75 : 12,588.12 = 5,142.86 : x
  2. Step 2: Convert to fraction form
    9,121.75/12,588.12 = 5,142.86/x
  3. Step 3: Cross multiply
    9,121.75x = 12,588.12 × 5,142.86
  4. Step 4: Simplify right side
    9,121.75x = 64,738,938.82
  5. Step 5: Solve for x
    x = 64,738,938.82/9,121.75
  6. Step 6: Final answer
    x = 7,097.21

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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.