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Finding the Fourth Proportional to 2,125.15, 3,187.71 and 664.30

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Solution

The fourth proportional to 2,125.15, 3,187.71 and 664.30 is: 996.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,125.15 : 3,187.71 = 664.30 : x
  2. Step 2: Convert to fraction form
    2,125.15/3,187.71 = 664.30/x
  3. Step 3: Cross multiply
    2,125.15x = 3,187.71 × 664.30
  4. Step 4: Simplify right side
    2,125.15x = 2,117,595.75
  5. Step 5: Solve for x
    x = 2,117,595.75/2,125.15
  6. Step 6: Final answer
    x = 996.45

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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.