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Finding the Fourth Proportional to 5,659.80, 8,477.55 and 4,687.80

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Solution

The fourth proportional to 5,659.80, 8,477.55 and 4,687.80 is: 7,021.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,659.80 : 8,477.55 = 4,687.80 : x
  2. Step 2: Convert to fraction form
    5,659.80/8,477.55 = 4,687.80/x
  3. Step 3: Cross multiply
    5,659.80x = 8,477.55 × 4,687.80
  4. Step 4: Simplify right side
    5,659.80x = 39,741,058.89
  5. Step 5: Solve for x
    x = 39,741,058.89/5,659.80
  6. Step 6: Final answer
    x = 7,021.64

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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.