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Finding the Fourth Proportional to 18,756, 28,132.74 and 11,358.36

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Solution

The fourth proportional to 18,756, 28,132.74 and 11,358.36 is: 17,036.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,756 : 28,132.74 = 11,358.36 : x
  2. Step 2: Convert to fraction form
    18,756/28,132.74 = 11,358.36/x
  3. Step 3: Cross multiply
    18,756x = 28,132.74 × 11,358.36
  4. Step 4: Simplify right side
    18,756x = 319,541,788.71
  5. Step 5: Solve for x
    x = 319,541,788.71/18,756
  6. Step 6: Final answer
    x = 17,036.78

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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.