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Finding the Fourth Proportional to 18,320.42, 27,480.54 and 7,788.80

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Solution

The fourth proportional to 18,320.42, 27,480.54 and 7,788.80 is: 11,683.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,320.42 : 27,480.54 = 7,788.80 : x
  2. Step 2: Convert to fraction form
    18,320.42/27,480.54 = 7,788.80/x
  3. Step 3: Cross multiply
    18,320.42x = 27,480.54 × 7,788.80
  4. Step 4: Simplify right side
    18,320.42x = 214,040,292.55
  5. Step 5: Solve for x
    x = 214,040,292.55/18,320.42
  6. Step 6: Final answer
    x = 11,683.16

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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.