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Finding the Fourth Proportional to 5,147.66, 7,720.67 and 1,637.21

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Solution

The fourth proportional to 5,147.66, 7,720.67 and 1,637.21 is: 2,455.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    5,147.66 : 7,720.67 = 1,637.21 : x
  2. Step 2: Convert to fraction form
    5,147.66/7,720.67 = 1,637.21/x
  3. Step 3: Cross multiply
    5,147.66x = 7,720.67 × 1,637.21
  4. Step 4: Simplify right side
    5,147.66x = 12,640,311.34
  5. Step 5: Solve for x
    x = 12,640,311.34/5,147.66
  6. Step 6: Final answer
    x = 2,455.55

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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.