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Finding the Fourth Proportional to 28,518.72, 42,762.42 and 8,791.80

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Solution

The fourth proportional to 28,518.72, 42,762.42 and 8,791.80 is: 13,182.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,518.72 : 42,762.42 = 8,791.80 : x
  2. Step 2: Convert to fraction form
    28,518.72/42,762.42 = 8,791.80/x
  3. Step 3: Cross multiply
    28,518.72x = 42,762.42 × 8,791.80
  4. Step 4: Simplify right side
    28,518.72x = 375,958,644.16
  5. Step 5: Solve for x
    x = 375,958,644.16/28,518.72
  6. Step 6: Final answer
    x = 13,182.87

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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.