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Finding the Fourth Proportional to 17,145.20, 25,717.80 and 13,257.20

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Solution

The fourth proportional to 17,145.20, 25,717.80 and 13,257.20 is: 19,885.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,145.20 : 25,717.80 = 13,257.20 : x
  2. Step 2: Convert to fraction form
    17,145.20/25,717.80 = 13,257.20/x
  3. Step 3: Cross multiply
    17,145.20x = 25,717.80 × 13,257.20
  4. Step 4: Simplify right side
    17,145.20x = 340,946,018.16
  5. Step 5: Solve for x
    x = 340,946,018.16/17,145.20
  6. Step 6: Final answer
    x = 19,885.80

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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.