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Finding the Fourth Proportional to 18,871.69, 28,310.94 and 7,772.32

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Solution

The fourth proportional to 18,871.69, 28,310.94 and 7,772.32 is: 11,659.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,871.69 : 28,310.94 = 7,772.32 : x
  2. Step 2: Convert to fraction form
    18,871.69/28,310.94 = 7,772.32/x
  3. Step 3: Cross multiply
    18,871.69x = 28,310.94 × 7,772.32
  4. Step 4: Simplify right side
    18,871.69x = 220,041,685.18
  5. Step 5: Solve for x
    x = 220,041,685.18/18,871.69
  6. Step 6: Final answer
    x = 11,659.88

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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.