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Finding the Fourth Proportional to 18,929.58, 28,394.37 and 11,989.50

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Solution

The fourth proportional to 18,929.58, 28,394.37 and 11,989.50 is: 17,984.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,929.58 : 28,394.37 = 11,989.50 : x
  2. Step 2: Convert to fraction form
    18,929.58/28,394.37 = 11,989.50/x
  3. Step 3: Cross multiply
    18,929.58x = 28,394.37 × 11,989.50
  4. Step 4: Simplify right side
    18,929.58x = 340,434,299.12
  5. Step 5: Solve for x
    x = 340,434,299.12/18,929.58
  6. Step 6: Final answer
    x = 17,984.25

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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.