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Finding the Fourth Proportional to 28,491.56, 42,741.36 and 8,771.72

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Solution

The fourth proportional to 28,491.56, 42,741.36 and 8,771.72 is: 13,158.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,491.56 : 42,741.36 = 8,771.72 : x
  2. Step 2: Convert to fraction form
    28,491.56/42,741.36 = 8,771.72/x
  3. Step 3: Cross multiply
    28,491.56x = 42,741.36 × 8,771.72
  4. Step 4: Simplify right side
    28,491.56x = 374,915,242.34
  5. Step 5: Solve for x
    x = 374,915,242.34/28,491.56
  6. Step 6: Final answer
    x = 13,158.82

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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.