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Finding the Fourth Proportional to 47,620.80, 65,721.60 and 28,756.80

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Solution

The fourth proportional to 47,620.80, 65,721.60 and 28,756.80 is: 39,687.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    47,620.80 : 65,721.60 = 28,756.80 : x
  2. Step 2: Convert to fraction form
    47,620.80/65,721.60 = 28,756.80/x
  3. Step 3: Cross multiply
    47,620.80x = 65,721.60 × 28,756.80
  4. Step 4: Simplify right side
    47,620.80x = 1,889,942,906.88
  5. Step 5: Solve for x
    x = 1,889,942,906.88/47,620.80
  6. Step 6: Final answer
    x = 39,687.34

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1.5x scale

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.