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Finding the Fourth Proportional to 11,781.60, 17,686.80 and 6,520.80

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Solution

The fourth proportional to 11,781.60, 17,686.80 and 6,520.80 is: 9,789.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,781.60 : 17,686.80 = 6,520.80 : x
  2. Step 2: Convert to fraction form
    11,781.60/17,686.80 = 6,520.80/x
  3. Step 3: Cross multiply
    11,781.60x = 17,686.80 × 6,520.80
  4. Step 4: Simplify right side
    11,781.60x = 115,332,085.44
  5. Step 5: Solve for x
    x = 115,332,085.44/11,781.60
  6. Step 6: Final answer
    x = 9,789.17

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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.