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Finding the Fourth Proportional to 18,891.42, 28,312.86 and 7,805.88

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Solution

The fourth proportional to 18,891.42, 28,312.86 and 7,805.88 is: 11,698.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,891.42 : 28,312.86 = 7,805.88 : x
  2. Step 2: Convert to fraction form
    18,891.42/28,312.86 = 7,805.88/x
  3. Step 3: Cross multiply
    18,891.42x = 28,312.86 × 7,805.88
  4. Step 4: Simplify right side
    18,891.42x = 221,006,787.62
  5. Step 5: Solve for x
    x = 221,006,787.62/18,891.42
  6. Step 6: Final answer
    x = 11,698.79

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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.