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Finding the Fourth Proportional to 19,992.80, 29,965.20 and 13,752.80

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Solution

The fourth proportional to 19,992.80, 29,965.20 and 13,752.80 is: 20,612.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,992.80 : 29,965.20 = 13,752.80 : x
  2. Step 2: Convert to fraction form
    19,992.80/29,965.20 = 13,752.80/x
  3. Step 3: Cross multiply
    19,992.80x = 29,965.20 × 13,752.80
  4. Step 4: Simplify right side
    19,992.80x = 412,105,402.56
  5. Step 5: Solve for x
    x = 412,105,402.56/19,992.80
  6. Step 6: Final answer
    x = 20,612.69

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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.