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Finding the Fourth Proportional to 18,685, 28,014.54 and 11,291.32

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Solution

The fourth proportional to 18,685, 28,014.54 and 11,291.32 is: 16,929.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,685 : 28,014.54 = 11,291.32 : x
  2. Step 2: Convert to fraction form
    18,685/28,014.54 = 11,291.32/x
  3. Step 3: Cross multiply
    18,685x = 28,014.54 × 11,291.32
  4. Step 4: Simplify right side
    18,685x = 316,321,135.79
  5. Step 5: Solve for x
    x = 316,321,135.79/18,685
  6. Step 6: Final answer
    x = 16,929.15

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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.