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Finding the Fourth Proportional to 18,708.40, 28,067.70 and 7,612.60

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Solution

The fourth proportional to 18,708.40, 28,067.70 and 7,612.60 is: 11,420.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,708.40 : 28,067.70 = 7,612.60 : x
  2. Step 2: Convert to fraction form
    18,708.40/28,067.70 = 7,612.60/x
  3. Step 3: Cross multiply
    18,708.40x = 28,067.70 × 7,612.60
  4. Step 4: Simplify right side
    18,708.40x = 213,668,173.02
  5. Step 5: Solve for x
    x = 213,668,173.02/18,708.40
  6. Step 6: Final answer
    x = 11,420.98

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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.