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Finding the Fourth Proportional to 12,811.57, 17,679.96 and 7,222.57

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Solution

The fourth proportional to 12,811.57, 17,679.96 and 7,222.57 is: 9,967.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,811.57 : 17,679.96 = 7,222.57 : x
  2. Step 2: Convert to fraction form
    12,811.57/17,679.96 = 7,222.57/x
  3. Step 3: Cross multiply
    12,811.57x = 17,679.96 × 7,222.57
  4. Step 4: Simplify right side
    12,811.57x = 127,694,624.18
  5. Step 5: Solve for x
    x = 127,694,624.18/12,811.57
  6. Step 6: Final answer
    x = 9,967.14

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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.