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Finding the Fourth Proportional to 18,771.68, 25,915.20 and 12,812.24

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Solution

The fourth proportional to 18,771.68, 25,915.20 and 12,812.24 is: 17,687.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,771.68 : 25,915.20 = 12,812.24 : x
  2. Step 2: Convert to fraction form
    18,771.68/25,915.20 = 12,812.24/x
  3. Step 3: Cross multiply
    18,771.68x = 25,915.20 × 12,812.24
  4. Step 4: Simplify right side
    18,771.68x = 332,031,762.05
  5. Step 5: Solve for x
    x = 332,031,762.05/18,771.68
  6. Step 6: Final answer
    x = 17,687.91

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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.