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Finding the Fourth Proportional to 1,638.70, 2,459.06 and 664.81

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Solution

The fourth proportional to 1,638.70, 2,459.06 and 664.81 is: 997.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,638.70 : 2,459.06 = 664.81 : x
  2. Step 2: Convert to fraction form
    1,638.70/2,459.06 = 664.81/x
  3. Step 3: Cross multiply
    1,638.70x = 2,459.06 × 664.81
  4. Step 4: Simplify right side
    1,638.70x = 1,634,807.68
  5. Step 5: Solve for x
    x = 1,634,807.68/1,638.70
  6. Step 6: Final answer
    x = 997.62

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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.