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Finding the Fourth Proportional to 28,066.21, 42,099.21 and 7,289.71

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Solution

The fourth proportional to 28,066.21, 42,099.21 and 7,289.71 is: 10,934.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,066.21 : 42,099.21 = 7,289.71 : x
  2. Step 2: Convert to fraction form
    28,066.21/42,099.21 = 7,289.71/x
  3. Step 3: Cross multiply
    28,066.21x = 42,099.21 × 7,289.71
  4. Step 4: Simplify right side
    28,066.21x = 306,890,926.88
  5. Step 5: Solve for x
    x = 306,890,926.88/28,066.21
  6. Step 6: Final answer
    x = 10,934.53

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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.