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Finding the Fourth Proportional to 2,109.64, 3,163.80 and 648.40

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Solution

The fourth proportional to 2,109.64, 3,163.80 and 648.40 is: 972.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,109.64 : 3,163.80 = 648.40 : x
  2. Step 2: Convert to fraction form
    2,109.64/3,163.80 = 648.40/x
  3. Step 3: Cross multiply
    2,109.64x = 3,163.80 × 648.40
  4. Step 4: Simplify right side
    2,109.64x = 2,051,407.92
  5. Step 5: Solve for x
    x = 2,051,407.92/2,109.64
  6. Step 6: Final answer
    x = 972.40

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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.