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Finding the Fourth Proportional to 28,646.90, 42,965.39 and 7,865.54

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Solution

The fourth proportional to 28,646.90, 42,965.39 and 7,865.54 is: 11,796.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,646.90 : 42,965.39 = 7,865.54 : x
  2. Step 2: Convert to fraction form
    28,646.90/42,965.39 = 7,865.54/x
  3. Step 3: Cross multiply
    28,646.90x = 42,965.39 × 7,865.54
  4. Step 4: Simplify right side
    28,646.90x = 337,945,993.66
  5. Step 5: Solve for x
    x = 337,945,993.66/28,646.90
  6. Step 6: Final answer
    x = 11,796.95

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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.