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Finding the Fourth Proportional to 19,786.60, 29,679.90 and 18,911.80

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Solution

The fourth proportional to 19,786.60, 29,679.90 and 18,911.80 is: 28,367.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,786.60 : 29,679.90 = 18,911.80 : x
  2. Step 2: Convert to fraction form
    19,786.60/29,679.90 = 18,911.80/x
  3. Step 3: Cross multiply
    19,786.60x = 29,679.90 × 18,911.80
  4. Step 4: Simplify right side
    19,786.60x = 561,300,332.82
  5. Step 5: Solve for x
    x = 561,300,332.82/19,786.60
  6. Step 6: Final answer
    x = 28,367.70

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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.