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Finding the Fourth Proportional to 20,995.25, 31,492.88 and 7,144.25

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Solution

The fourth proportional to 20,995.25, 31,492.88 and 7,144.25 is: 10,716.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,995.25 : 31,492.88 = 7,144.25 : x
  2. Step 2: Convert to fraction form
    20,995.25/31,492.88 = 7,144.25/x
  3. Step 3: Cross multiply
    20,995.25x = 31,492.88 × 7,144.25
  4. Step 4: Simplify right side
    20,995.25x = 224,992,972.22
  5. Step 5: Solve for x
    x = 224,992,972.22/20,995.25
  6. Step 6: Final answer
    x = 10,716.38

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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.