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Finding the Fourth Proportional to 2,125.40, 3,188.54 and 664.66

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Solution

The fourth proportional to 2,125.40, 3,188.54 and 664.66 is: 997.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,125.40 : 3,188.54 = 664.66 : x
  2. Step 2: Convert to fraction form
    2,125.40/3,188.54 = 664.66/x
  3. Step 3: Cross multiply
    2,125.40x = 3,188.54 × 664.66
  4. Step 4: Simplify right side
    2,125.40x = 2,119,288.69
  5. Step 5: Solve for x
    x = 2,119,288.69/2,125.40
  6. Step 6: Final answer
    x = 997.13

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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.