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Finding the Fourth Proportional to 28,712.72, 43,069.08 and 8,991.38

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Solution

The fourth proportional to 28,712.72, 43,069.08 and 8,991.38 is: 13,487.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,712.72 : 43,069.08 = 8,991.38 : x
  2. Step 2: Convert to fraction form
    28,712.72/43,069.08 = 8,991.38/x
  3. Step 3: Cross multiply
    28,712.72x = 43,069.08 × 8,991.38
  4. Step 4: Simplify right side
    28,712.72x = 387,250,605.92
  5. Step 5: Solve for x
    x = 387,250,605.92/28,712.72
  6. Step 6: Final answer
    x = 13,487.07

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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.