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Finding the Fourth Proportional to 13,615.70, 20,381.42 and 11,623.10

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Solution

The fourth proportional to 13,615.70, 20,381.42 and 11,623.10 is: 17,398.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,615.70 : 20,381.42 = 11,623.10 : x
  2. Step 2: Convert to fraction form
    13,615.70/20,381.42 = 11,623.10/x
  3. Step 3: Cross multiply
    13,615.70x = 20,381.42 × 11,623.10
  4. Step 4: Simplify right side
    13,615.70x = 236,895,209.95
  5. Step 5: Solve for x
    x = 236,895,209.95/13,615.70
  6. Step 6: Final answer
    x = 17,398.69

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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.