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Finding the Fourth Proportional to 18,870.66, 28,281.42 and 7,764.48

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Solution

The fourth proportional to 18,870.66, 28,281.42 and 7,764.48 is: 11,636.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,870.66 : 28,281.42 = 7,764.48 : x
  2. Step 2: Convert to fraction form
    18,870.66/28,281.42 = 7,764.48/x
  3. Step 3: Cross multiply
    18,870.66x = 28,281.42 × 7,764.48
  4. Step 4: Simplify right side
    18,870.66x = 219,590,519.96
  5. Step 5: Solve for x
    x = 219,590,519.96/18,870.66
  6. Step 6: Final answer
    x = 11,636.61

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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.