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Finding the Fourth Proportional to 21,715.56, 29,974.56 and 12,762.84

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Solution

The fourth proportional to 21,715.56, 29,974.56 and 12,762.84 is: 17,616.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,715.56 : 29,974.56 = 12,762.84 : x
  2. Step 2: Convert to fraction form
    21,715.56/29,974.56 = 12,762.84/x
  3. Step 3: Cross multiply
    21,715.56x = 29,974.56 × 12,762.84
  4. Step 4: Simplify right side
    21,715.56x = 382,560,513.35
  5. Step 5: Solve for x
    x = 382,560,513.35/21,715.56
  6. Step 6: Final answer
    x = 17,616.88

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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.