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Finding the Fourth Proportional to 18,909.58, 28,362.21 and 5,059.66

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Solution

The fourth proportional to 18,909.58, 28,362.21 and 5,059.66 is: 7,588.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,909.58 : 28,362.21 = 5,059.66 : x
  2. Step 2: Convert to fraction form
    18,909.58/28,362.21 = 5,059.66/x
  3. Step 3: Cross multiply
    18,909.58x = 28,362.21 × 5,059.66
  4. Step 4: Simplify right side
    18,909.58x = 143,503,139.45
  5. Step 5: Solve for x
    x = 143,503,139.45/18,909.58
  6. Step 6: Final answer
    x = 7,588.91

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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.