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Finding the Fourth Proportional to 2,108.60, 3,163.20 and 647.48

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Solution

The fourth proportional to 2,108.60, 3,163.20 and 647.48 is: 971.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,108.60 : 3,163.20 = 647.48 : x
  2. Step 2: Convert to fraction form
    2,108.60/3,163.20 = 647.48/x
  3. Step 3: Cross multiply
    2,108.60x = 3,163.20 × 647.48
  4. Step 4: Simplify right side
    2,108.60x = 2,048,108.74
  5. Step 5: Solve for x
    x = 2,048,108.74/2,108.60
  6. Step 6: Final answer
    x = 971.31

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1.5x scale

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.