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Finding the Fourth Proportional to 28,458.70, 42,694.39 and 8,739.25

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Solution

The fourth proportional to 28,458.70, 42,694.39 and 8,739.25 is: 13,110.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,458.70 : 42,694.39 = 8,739.25 : x
  2. Step 2: Convert to fraction form
    28,458.70/42,694.39 = 8,739.25/x
  3. Step 3: Cross multiply
    28,458.70x = 42,694.39 × 8,739.25
  4. Step 4: Simplify right side
    28,458.70x = 373,116,947.81
  5. Step 5: Solve for x
    x = 373,116,947.81/28,458.70
  6. Step 6: Final answer
    x = 13,110.82

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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.