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Finding the Fourth Proportional to 20,681.20, 30,987.60 and 11,900.80

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Solution

The fourth proportional to 20,681.20, 30,987.60 and 11,900.80 is: 17,831.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,681.20 : 30,987.60 = 11,900.80 : x
  2. Step 2: Convert to fraction form
    20,681.20/30,987.60 = 11,900.80/x
  3. Step 3: Cross multiply
    20,681.20x = 30,987.60 × 11,900.80
  4. Step 4: Simplify right side
    20,681.20x = 368,777,230.08
  5. Step 5: Solve for x
    x = 368,777,230.08/20,681.20
  6. Step 6: Final answer
    x = 17,831.52

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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.