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Finding the Fourth Proportional to 18,989.28, 28,494 and 7,309.92

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Solution

The fourth proportional to 18,989.28, 28,494 and 7,309.92 is: 10,968.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,989.28 : 28,494 = 7,309.92 : x
  2. Step 2: Convert to fraction form
    18,989.28/28,494 = 7,309.92/x
  3. Step 3: Cross multiply
    18,989.28x = 28,494 × 7,309.92
  4. Step 4: Simplify right side
    18,989.28x = 208,288,860.48
  5. Step 5: Solve for x
    x = 208,288,860.48/18,989.28
  6. Step 6: Final answer
    x = 10,968.76

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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.