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Finding the Fourth Proportional to 28,490.87, 42,736.40 and 8,769.30

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Solution

The fourth proportional to 28,490.87, 42,736.40 and 8,769.30 is: 13,153.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,490.87 : 42,736.40 = 8,769.30 : x
  2. Step 2: Convert to fraction form
    28,490.87/42,736.40 = 8,769.30/x
  3. Step 3: Cross multiply
    28,490.87x = 42,736.40 × 8,769.30
  4. Step 4: Simplify right side
    28,490.87x = 374,768,268.67
  5. Step 5: Solve for x
    x = 374,768,268.67/28,490.87
  6. Step 6: Final answer
    x = 13,153.98

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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.