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Finding the Fourth Proportional to 2,108.64, 3,163.44 and 647.76

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Solution

The fourth proportional to 2,108.64, 3,163.44 and 647.76 is: 971.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,108.64 : 3,163.44 = 647.76 : x
  2. Step 2: Convert to fraction form
    2,108.64/3,163.44 = 647.76/x
  3. Step 3: Cross multiply
    2,108.64x = 3,163.44 × 647.76
  4. Step 4: Simplify right side
    2,108.64x = 2,049,149.89
  5. Step 5: Solve for x
    x = 2,049,149.89/2,108.64
  6. Step 6: Final answer
    x = 971.79

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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.