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Finding the Fourth Proportional to 28,861.75, 43,290.88 and 8,871.42

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Solution

The fourth proportional to 28,861.75, 43,290.88 and 8,871.42 is: 13,306.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,861.75 : 43,290.88 = 8,871.42 : x
  2. Step 2: Convert to fraction form
    28,861.75/43,290.88 = 8,871.42/x
  3. Step 3: Cross multiply
    28,861.75x = 43,290.88 × 8,871.42
  4. Step 4: Simplify right side
    28,861.75x = 384,051,718.81
  5. Step 5: Solve for x
    x = 384,051,718.81/28,861.75
  6. Step 6: Final answer
    x = 13,306.60

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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.