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Finding the Fourth Proportional to 47,688.80, 65,790 and 28,815

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Solution

The fourth proportional to 47,688.80, 65,790 and 28,815 is: 39,752.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    47,688.80 : 65,790 = 28,815 : x
  2. Step 2: Convert to fraction form
    47,688.80/65,790 = 28,815/x
  3. Step 3: Cross multiply
    47,688.80x = 65,790 × 28,815
  4. Step 4: Simplify right side
    47,688.80x = 1,895,738,850
  5. Step 5: Solve for x
    x = 1,895,738,850/47,688.80
  6. Step 6: Final answer
    x = 39,752.29

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.